ASRock B550M Steel Legend Service Manual

Version 1.0

Published April 2020

Copyright©2020 ASRock INC. All rights reserved.

Copyright Notice:

No part of this documentation may be reproduced, transcribed, transmitted, or
translated in any language, in any form or by any means, except duplication of
documentation by the purchaser for backup purpose, without written consent of
ASRock Inc.

Products and corporate names appearing in this documentation may or may not
be registered trademarks or copyrights of their respective companies, and are used
only for identication or explanation and to the owners’ benet, without intent to

infringe.

Disclaimer:

Specications and information contained in this documentation are furnished for
informational use only and subject to change without notice, and should not be
constructed as a commitment by ASRock. ASRock assumes no responsibility for
any errors or omissions that may appear in this documentation.

With respect to the contents of this documentation, ASRock does not provide
warranty of any kind, either expressed or implied, including but not limited to
the implied warranties or conditions of merchantability or tness for a particular
purpose.

In no event shall ASRock, its directors, ocers, employees, or agents be liable for
any indirect, special, incidental, or consequential damages (including damages for
loss of prots, loss of business, loss of data, interruption of business and the like),
even if ASRock has been advised of the possibilit y of such damages arising from any
defect or error in the documentation or product.

is device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that

may cause undesired operation.

CALIFORNIA, USA ONLY

e Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance
controlled in Perchlorate Best Management Practices (BMP) regulations passed by the
California Legislature. When you discard the Lithium battery in California, USA, please
follow the related regulations in advance.
“Perchlorate Material-special handling may apply, see ww w.dtsc.ca.gov/hazardouswaste/
perchlorate”

ASRock Website: http://www.asrock.com

AUSTRALIA ONLY

Our goods come with guarantees that cannot be excluded under the Australian
Consumer Law. You are entitled to a replacement or refund for a major failure and
compensation for any other reasonably foreseeable loss or damage caused by our
goods. You are also entitled to have the goods repaired or replaced if the goods fail
to be of acceptable quality and the failure does not amount to a major failure. If
you require assistance please call ASRock Tel : [phone] ext.123 (Standard
International call charges apply)

e terms HDMI® and HDMI High-Denition Multimedia Interface, and the
HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the
United States and other countries.

Contents

Chapter 1 Introduction 1

1.1 Package Contents 1

1.2 Specications 2

1.3 Motherboard Layout 7

1.4 I/O Panel 9

Chapter 2 Installation 11

2.1 Installing the CPU 12

2.2 Installing the CPU Fan and Heatsink 14

2.3 Installing Memory Modules (DIMM) 22

2.4 Expansion Slots (PCI Express Slots) 25

2.5 Jumpers Setup 26

2.6 Onboard Headers and Connectors 27

2.7 Clear CMOS Button 33

2.8 Post Status Checker 34

2.9 CrossFireXTM and Quad CrossFireXTM Operation Guide 35

2.9.1 Installing Two CrossFireXTM-Ready Graphics Cards 35

2.9.2 Driver Installation and Setup 37

2.10 M.2 WiFi/BT Module Installation Guide (M2_3) 38

2.11 M.2_SSD (NGFF) Module Installation Guide (M2_1) 40

2.12 M.2_SSD (NGFF) Module Installation Guide (M2_2) 43

Chapter 3 Software and Utilities Operation 46

3.1 Installing Drivers 46

3.2 ASRock Motherboard Utility (A-Tuning) 47

3.2.1 Installing ASRock Motherboard Utility (A-Tuning) 47

3.2.2 Using ASRock Motherboard Utility (A-Tuning) 47

3.3 ASRock Live Update & APP Shop 50

3.3.1 UI Overview 50

3.3.2 Apps 51

3.3.3 BIOS & Drivers 54

3.3.4 Setting 55

3.4 Nahimic Audio 56

3.5 ASRock Polychrome SYNC 57

Chapter 4 UEFI SETUP UTILITY 60

4.1 Introduction 60

4.1.1 UEFI Menu Bar 60

4.1.2 Navigation Keys 61

4.2 Main Screen 62

4.3 OC Tweaker Screen 63

4.4 Advanced Screen 67

4.4.1 CPU Conguration 68

4.4.2 Onboard Devices Conguration 69

4.4.3 Storage Conguration 71

4.4.4 ACPI Conguration 72

4.4.5 Trusted Computing 73

4.4.6 AMD CBS 74

4.4.7 AMD PBS 75

4.4.8 AMD Overclocking 76

4.5 Tools 77

4.6 Hardware Health Event Monitoring Screen 78

4.7 Security Screen 81

4.8 Boot Screen 82

4.9 Exit Screen 85

B550M Steel Legend

Chapter 1 Introduction

ank you for purchasing ASRock B550M Steel Legend motherboard, a reliable

motherboard produced under ASRock’s consistently stringent quality control.

It delivers excellent performance with robust design conforming to ASRock’s

commitment to quality and endurance.

In this documentation, Chapter 1 and 2 contains the introduction of the

motherboard and step-by-step installation guides. Chapter 3 contains the operation

guide of the soware and utilities. Chapter 4 contains the conguration guide of

the BIOS setup.

Becau se the motherboard specications and th e BIOS soware might be updated, the
content of this documentation will be subject to change without notice. In ca se any modi­cations of this documentation occur, the u pdated version will be available on ASRock ’s
website w ithout further notice. If you require technical support related to this mother­board, please visit our website for specic information about the model you are using. You
may nd the l atest VGA cards and CPU suppor t list on ASRock’s website a s well. ASRock
website http://www.asrock.com.

1.1 Package Contents

ASRock B550M Steel Legend Motherboard (Micro ATX Form Factor)

•

ASRock B550M Steel Legend Quick Installation Guide

•

ASRock B550M Steel Legend Support CD

•

2 x Serial ATA (SATA) Data Cables (Optional)

•

2 x Screws for M.2 Socket (Optional)

•

English

1

1.2 Specications

Platform

CPU

Chipset

Memory

•

•

•

* Not compatible with AMD Ryzen™ 5 3400G and Ryzen™ 3

3200G.

•

•

•

•

•

•

•

* Please refer to Memory Support List on ASRock’s website for

more information. (http://www.asrock.com/)

* Please refer to page 22 for DDR4 UDIMM maximum

frequency support.

•

•

•

Micro ATX Form Factor

2oz Copper PCB

Supports 3rd Gen AMD AM4 Ryzen™ / future AMD Ryzen™

Processors (3000 and 4000 Series Processors)*

Digi Power design

10 Power Phase design

AMD B550

Dual Channel DDR4 Memory Technology

4 x DDR4 DIMM Slots

AMD Ryzen series CPUs (Matisse) support DDR4

4533+(OC)/4466(OC)/440 0(OC)/4333(OC)/4266(OC)/

420 0(OC)/4133(OC)/40 00(OC)/3866(OC)/3800(OC)/3733

(OC)/3600(OC)/3466(OC)/3200/2933/2667/2400/2133 ECC

& non-ECC, un-buered memory*

AMD Ryzen series APUs (Renoir) support DDR4 4733+

(OC)/4666(OC)/4600(OC)/4533(OC)/4466(OC)/

4400(OC)/4333(OC)/4266(OC)/4200(OC)/4133(OC)/

4000(OC)/3866(OC)/3800(OC)/3733(OC)/3600(OC)/

3466(OC)/3200/2933/2667/2400/2133 ECC & non-ECC, un-

buered memory*

Max. capacity of system memory: 128GB

Supports Extreme Memory Prole (XMP) memory modules

15μ Gold Contact in DIMM Slots

English

2

Expansion
Slot

AMD Ryzen series CPUs (Matisse)

2 x PCI Express x16 Slots (PCIE1: Gen4x16 mode; PCIE3:

•

Gen3 x4 mode)*

AMD Ryzen series APUs (Renoir)

2 x PCI Express x16 Slots (PCIE1: Gen3x16 mode; PCIE3:

•

Gen3 x4 mode)*

* Supports NVMe SSD as boot disks

1 x PCI Express 3.0 x1 Slot

•

B550M Steel Legend

Graphics

Supports AMD Quad CrossFireXTM and CrossFireX

•

15μ Gold Contact in VGA PCIe Slot (PCIE1)

•

1 x M.2 Socket (Key E), supports type 2230 WiFi/BT

•

module

Integrated AMD RadeonTM Vega Series Graphics in Ryzen

•

Series APU*

* Actual support may vary by CPU

DirectX 12, Pixel Shader 5.0

•

Shared memor y default 2GB. Max Shared memory supports

•

up to 16GB.

* e Max shared memory 16GB requires 32GB system

memory installed.

Dual graphics output: support HDMI and DisplayPort 1.4

•

ports by independent display controllers

Supports HDMI 2.1 with max. resolution up to 4K x 2K

•

(4096x2160) @ 60Hz

Supports DisplayPort 1.4 with max. resolution up to 5K

•

(5120x2880)@120Hz

Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and

•

HBR (High Bit Rate Audio) with HDMI 2.1 Port (Compliant

HDMI monitor is required)

Supports HDR (High Dynamic Range) with HDMI 2.1

•

Supports HDCP 2.3 with HDMI 2.1 and DisplayPort 1.4

•

Ports

Supports 4K Ultra HD (UHD) playback with HDMI 2.1 and

•

DisplayPort 1.4 Ports

Supports Microso PlayReady®

•

TM

Audio

7.1 CH HD Audio with Content Protection (Realtek

•

ALC1200 Audio Codec)

Premium Blu-ray Audio support

•

Supports Surge Protection

•

PCB Isolate Shielding

•

Individual PCB Layers for R/L Audio Channel

•

Gold Audio Jacks

•

Nahimic Audio

•

English

3

LAN

Rear Panel
I/O

2.5 Gigabit LAN 10/100/1000/2500 Mb/s

•

Dragon RTL8125BG

•

Supports Dragon 2.5G LAN Soware

•

- Smart Auto Adjust Bandwidth Control

- Visual User Friendly UI

- Visual Network Usage Statistics

- Optimized Default Setting for Game, Browser, and

Streaming Modes

- User Customized Priority Control

Supports Wake-On-LAN

•

Supports Lightning/ESD Protection

•

Supports Energy Ecient Ethernet 802.3az

•

Supports PXE

•

2 x Antenna Ports (on I/O Panel Shield)

•

1 x PS/2 Mouse/Keyboard Port

•

1 x HDMI Port

•

1 x DisplayPort 1.4

•

1 x Optical SPDIF Out Port

•

1 x USB 3.2 Gen2 Type-A Port (10 Gb/s) (Supports ESD

•

Protection)

1 x USB 3.2 Gen2 Type-C Port (10 Gb/s) (Supports ESD

•

Protection)

4 x USB 3.2 Gen1 Ports (ASMedia ASM1074 hub) (Supports

•

ESD Protection)

2 x USB 2.0 Ports (Supports ESD Protection)

•

1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED

•

LED)

1 x Clear CMOS Button

•

HD Audio Jacks: Rear Speaker / Central / Bass / Line in /

•

Front Speaker / Microphone (Gold Audio Jacks)

English

4

Storage

6 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0,

•

RAID 1 and RAID 10), NCQ, AHCI and Hot Plug*

* M2_ 2 and SATA3_5_6 share lanes. If either one of them is in

use, the other one will be disabled.

1 x Hyper M.2 Socket (M2_1), supports M Key ty pe 2280

•

M.2 PCI Express module up to Gen4x4 (64 Gb/s) (with

Matisse) or Gen3x4 (32 Gb/s) (with Renoir)**

Connector

B550M Steel Legend

1 x M.2 Socket (M2_2), supports M Key ty pe 2280 M.2

•

SATA3 6.0 Gb/s module and M.2 PCI Express module up to

Gen3 x2 (16 Gb/s)**

** Supports NVMe SSD as boot disks

** Supports ASRock U.2 Kit

1 x SPI TPM Header

•

1 x Power LED and Speaker Header

•

2 x RGB LED Headers

•

* Support in total up to 12V/3A, 36W LED Strip

2 x Addressable LED Headers

•

* Support in total up to 5V/3A, 15W LED Strip

1 x CPU Fan Connector (4-pin)

•

* e CPU Fan Connector supports the CPU fan of maximum

1A (12W) fan power.

1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan

•

Speed Control)

4 x Chassis/Water Pump Fan Connectors (4-pin) (Smart

•

Fan Speed Control)

* e Chassis/Water Pump Fan supports the water cooler fan

of maximum 2A (24W) fan power.

* CPU_FAN2/WP, CHA_FAN1/WP, CHA_FAN2/WP, CHA_

FAN3/WP and CHA_FAN4/WP can auto detect if 3-pin or

4-pin fan is in use.

1 x 24 pin ATX Power Connector (Hi-Density Power Con-

•

nector)

1 x 8 pin 12V Power Connector (Hi-Density Power Connec-

•

tor)

1 x 4 pin 12V Power Connector (Hi-Density Power Connec-

•

tor)

1 x Front Panel Audio Connector

•

2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports

•

ESD Protection)

2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports)

•

(Supports ESD Protection)

English

5

BIOS
Feature

Hardware
Monitor

OS

Certica­tions

AMI UEFI Legal BIOS with GUI support

•

Supports “Plug and Play”

•

ACPI 5.1 compliance wake up events

•

Supports jumperfree

•

SMBIOS 2.3 support

•

CPU, CPU VDDCR_SOC, DRAM, VPPM, 1.05V_PROM_

•

S5, 2.5V_PROM, +1.8VSB, VDDP Voltage Multi-adjustment

Temperature Sensing: CPU, CPU/Water Pump, Chassis/

•

Water Pump Fans

Fan Tachometer: CPU, CPU/Water Pump, Chassis/Water

•

Pump Fans

Quiet Fan (Auto adjust chassis fan speed by CPU tempera-

•

ture): CPU, CPU/Water Pump, Chassis/Water Pump Fans

Fan Multi-Speed Control: CPU, CPU/Water Pump,

•

Chassis/Water Pump Fans

Voltage monitoring: +12V, +5V, +3.3V, CPU Vcore, CPU

•

VDDCR_SOC, DRAM, VPPM, 1.05V_PROM_S5, +1.8V,

VDDP

Microso® Windows® 10 64-bit

•

FCC, CE

•

ErP/EuP ready (ErP/EuP ready power supply is required)

•

English

6

* For detailed product information, please visit our website: http://www.asrock .com

Please realize that the re is a certain risk involved with overclocking, including adjusting
the setting in the BIO S, applying Untied Overclocking Technology, or using third-par ty
overclocking tools. O verclocking may aect your syste m’s stabilit y, or even cause damage to
the components and devices of your syste m. It should be done at your own risk and expe nse.
We are not responsibl e for possible damage caused by overclocking.

5

4

6

10

12

14

15

1

16

Sup er

I/O

CLRCMOS1

1

PCIE1

HD_AUDIO1

1

CPU_FAN2/WP

RJ- 45 LAN

SOCKETAM4

F_USB3 _1_2

1

CHA_FAN1/WP

1

RoHS

SPK_PLED1

1

DDR 4_A1 (6 4 bit, 288 -pin mo dule)

DDR 4_A2 (6 4 bit, 288 -pin mo dule)

DDR 4_B1 (6 4 bit, 288 -pin mo dule)

DDR 4_B2 (6 4 bit, 288 -pin mo dule)

PCIE2

PCIE3

HDLED RESET

PLED PWRBTN

PANEL1

M2_2

M2_1

AMD

Promontory

B550

1

USB_3_4

SATA3_4

SATA3_3

SATA3_6

SATA3_5

24

31

USB 3.2 Gen1
T: USB3_3
B: USB3_4

USB 3.2 Gen2
T: USB31_TA_1
B: USB31_TC_1

HDMI1

USB 2.0
T: USB1
B: USB2

PS2

Keyboard/

Mouse

CPU_FAN1

CHA_FAN4/WP

1

USB_5_6

29

28

30

DP1

USB 3.2 Gen1
T: USB3_1
B: USB3_2

Top:

Central/Bass

Center :

REAR SPK

Top:

LINE IN

Center :

FRONT

Bottom :

Optica l

SPDIF

Bottom :

MIC IN

ATX12V2

ATX12V1

2

3

ADDR_LED1

1

1

RGB_LED1

8

7

SATA3_1

SATA3_2

11

1

SPI_TPM_J1

1

F_USB3_3_4

25

CHA_FAN2
/WP

26

CHA_FAN3
/WP

RGB_LED2

1

ADDR_LED2

1

CMOS

Battery

CLRC
BTN1

LAN

AUDIO
CODEC

13

27

22

CPU

DRAM

VGA

BOOT

21

M2_3

NUT1

ATXP WR1

1.3 Motherboard Layout

B550M Steel Legend

23

19

20

17

18

9

English

7

English

No. Description

1 8 pin 12V Power Connector (ATX12V1)

2 4 pin 12V Power Connector (ATX12V2)

3 CPU Fan Connector (CPU_FAN1)

4 CPU/Water Pump Fan Connector (CPU_FAN2/WP)

5 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)

6 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)

7 RGB LED Header (RGB_LED1)

8 Addressable LED Header (ADDR_LED1)

9 ATX Power Connector (ATXPWR1)

10 USB 3.2 Gen1 Header (F_USB3_1_2)

11 SATA3 Connector (SATA3_2)

12 SATA3 Connector (SATA3_1)

13 SATA3 Connec tor (SATA 3_4)

14 SATA3 Connector (SATA3_3)

15 SATA3 Connector (SATA3_5)

16 SATA3 Connector (SATA3_6)

17 System Panel Header (PANEL1)

18 Power LED and Speaker Header (SPK_PLED1)

19 USB 3.2 Gen1 Header (F_USB3_3_4)

20 Chassis/Water Pump Fan Connector (CHA_FAN4/WP)

21 Post Status Checker (PSC)

22 SPI TPM Header (SPI_TPM_J1)

23 USB 2.0 Header (USB_3_4)

24 USB 2.0 Header (USB_5_6)

25 Chassis/Water Pump Fan Connector (CHA_FAN2/WP)

26 Chassis/Water Pump Fan Connector (CHA_FAN3/WP)

27 Clear CMOS Jumper (CLRCMOS1)

28 underbolt AIC Connector (TB1)

29 Addressable LED Header (ADDR_LED2)

30 RGB LED Header (RGB_LED2)

31 Front Panel Audio Header (HD_AUDIO1)

32 Chassis/Water Pump Fan Connector (CHA_FAN1/WP)

8

1.4 I/O Panel

1 2

B550M Steel Legend

3

547

6

1617 1415

12

13

11

No. Description No. Description

1 USB 2.0 Ports (USB_12)* 11 USB 3.2 Gen1 Ports

2 Antenna Ports (USB3_12)

(on I/O Panel Shield) 12 USB 3.2 Gen2 Type-A Port

3 LAN RJ-45 Port** (USB31_TA_1)

4 Central / Bass (Orange) 13 USB 3.2 Gen2 Type-C Port

5 Rear Speaker (Black) (USB31_TC_1)

6 Line In (Light Blue) 14 PS/2 Mouse/Keyboard Port

7 Front Speaker (Lime)*** 15 DisplayPort 1.4

8 Microphone (Pink) 16 HDMI Port

9 Optical SPDIF Out Port 17 Clear CMOS Button

10 USB 3.2 Gen1 Ports (USB3_34)

* Please note that the USB_ 2 consumes au xiliary power (+5VSB) while the other USB por ts consume DUAL
Power (+5VDUAL). e USB_ 2 is optimal for connecting the USB Type speake r and headset ..

8910

English

9

** ere are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications.

ACT/LINK LED

SPEED LED

LAN Por t

Activity / Link LED Speed LED

Status Description Status Description

O No Link O 10Mbps connection

Blinking Data Activity Orange

100Mbps/1Gbps

connection

On Link Green 2.5Gbps connection

*** If you use a 2-channel speak er, please connec t the speaker’s plug into “Front Speaker Jack”. See the table below

for connection d etails in accordance w ith the ty pe of speaker you use.

English

Audio Output

Channels

Front Speaker

(No. 7)

Rear Speaker

(No.5)

Central / Bass

(No. 4)

2 V -- -- --
4 V V -- --
6 V V V --
8 V V V V

Line In

(No. 6)

10

B550M Steel Legend

Chapter 2 Installation

is is a Micro ATX form factor motherboard. Before you install the motherboard,

study the conguration of your chassis to ensure that the motherboard ts into it.

Pre-installation Precautions

Take note of the following precautions before you install motherboard components

or change any motherboard settings.

Make sure to unplug the power cord before installing or removing the motherboard.

•

Failure to do so may cause physical injuries to you and damages to motherboard

components.

In order to avoid damage from static electricity to the motherboard’s components,

•

NEVER place your motherboard directly on a carpet. Also remember to use a grounded

wrist strap or touch a safety grounded object before you handle the components.

Hold components by the edges and do not touch the ICs.

•

Whenever you uninstall any components, place them on a grounded anti-static pad or

•

in the bag that comes with the components.

When placing screws to secure the motherboard to the chassis, please do not over-

•

tighten the screws! Doing so may damage the motherboard.

11

English

2.1 Installing the CPU

Unplug all power cables be fore installing the CPU.

1

English

12

2

B550M Steel Legend

3

13

English

2.2 Installing the CPU Fan and Heatsink

Aer you install the CPU into this motherboard, it is necessary to install a larger

heatsink and cooling fan to dissipate heat. You also need to spray thermal grease

between the CPU and the heatsink to improve heat dissipation. Make sure that the

CPU and the heatsink are securely fastened and in good contact with each other.

Please turn o the power or remove the power cord before changing a CPU or heat sink.

Installing the CPU Box Cooler SR1

1

English

14

2

B550M Steel Legend

3

4

1

N

FA

_

U

P

C

English

15

Installing the AM4 Box Cooler SR2

1

2

English

16

B550M Steel Legend

3

17

English

4

1
N

FA

_

U

P

C

*e diagrams shown here are for reference only. e headers might be in a dierent position on

your motherboard.

English

18

Installing the AM4 Box Cooler SR3

1

B550M Steel Legend

2

English

19

3

4

English

20

B550M Steel Legend

5

FAN1

CPU_

6

1

N

FA

_

U

P

C

2
D

E

L

_

B

RG

+12V

*e diagrams shown here are for reference only. e headers might be in a dierent position

on your motherboard.

English

21

2.3 Installing Memory Modules (DIMM)

is motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots,

and supports Dual Channel Memory Technology.

1. For dual channel cong uration , you always need to in stall identical (the same

brand, speed , size and chip-type) DDR4 DIMM pairs.

2. It is unable to activate Du al Channel Memory Technology with only one or three
memory module installed.

3. It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4
slot; otherwise, this motherboard and DIMM may be damaged.

4. We suggest that you install the memory modules on DDR4 _A 2 and DDR4_ B2 rst
for better DRAM compatibility on 2 DIMMs conguration.

AMD non-XMP Memory Frequency Support

Ryzen Series CPUs (Matisse):

English

UDIMM Memory Slot

A1 A2 B1 B2

Frequency

(Mhz)

- SR - - 3200

- DR - - 3200

- SR - SR 3200

- DR - DR 3200

SR SR SR SR 2933

SR/DR DR SR/DR DR 2667

SR/DR SR/DR SR/DR SR/DR 2667

22

Ryzen Series APUs (Renoir):

B550M Steel Legend

UDIMM Memory Slot

A1 A2 B1 B2

- SR - - 3200

- DR - - 3200

- SR - SR 3200

- DR - DR 3200

SR SR SR SR 2933

SR/DR DR SR/DR DR 2667

SR/DR SR/DR SR/DR SR/DR 2667

SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label

DR: Dua l rank DIMM, 2Rx4 or 2R x8 on DIMM module label

Frequency

(Mhz)

23

English

e DIMM only ts in one correct orientation. It will c ause permanent damage to
the motherboard and the DIMM if you force the DIMM into the slot at incor rect
orientation.

1

2

English

24

3

B550M Steel Legend

2.4 Expansion Slots (PCI Express Slots)

ere are 3 PCI Express slots on the motherboard.

Before installing an ex pansion card, please make sure that the power supply is
switched o or the power cord is unplugged . Please read the documentation of the
expan sion card and mak e necessary hardware settings for the card before you start
the installation.

PCIe slots:

PCIE1 (PCIe 4.0 x16 slot) is used for PCI Express x16 lane width graphics cards.

PCIE2 (PCIe 3.0 x1 slot) is used for PCI Express x1 lane width cards.

PCIE3 (PCIe 3.0 x16 slot) is used for PCI Express x4 lane width graphics cards.

PCIe Slot Congurations

PCIE1 PCIE2 PCIE3

Ryzen Series CPUs (Matisse) Gen4x16 Gen3x1 Gen3x4

Ryzen Series CPUs (Renoir) Gen3x16 Gen3x1 Gen3x4

For a better ther mal environme nt, please connect a chassi s fan to the motherboard’s
chassis fan connector (CHA_ FAN1/WP, CHA_ FAN2/WP , CHA_ FAN3/WP or CH A_
FAN4/WP ) when using multiple graphics card s.

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25

2.5 Jumpers Setup

e illustration shows how jumpers are setup. When the jumper cap is placed on

the pins, the jumper is “Short”. If no jumper cap is placed on the pins, the jumper is

“O pen”.

English

Clear CMOS Jumper

(CLRCMO S1)

(see p.7, No. 27)

CLRCMOS1 allows you to clear the data in CMOS. e data in CMOS includes

system setup information such as system password, date, time, and system setup

parameters. To clear and reset the system parameters to default setup, please

turn o the computer and unplug the power cord, then use a jumper cap to short

the pins on CLRCMOS1 for 3 seconds. Please remember to remove the jumper

cap aer clearing the CMOS. If you need to clear the CMOS when you just nish

updating the BIOS, you must boot up the system rst, and then shut it down

before you do the clear-CMOS action.

e Clear CMOS Button has th e same function as the Clear CMOS jumper.

2-pin Jumper

Short: Clear CMOS

Open: Default

26

2.6 Onboard Headers and Connectors

Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over these
heade rs and connectors. Placing jumper caps o ver the headers and connectors will cause
permanent damage to the motherboard.

B550M Steel Legend

System Panel Header

(9-pi n PANEL1)

(see p.7, No. 17)

PWRBTN (Power Button):

Connec t to the power button on the ch assi s front panel. You may congure the way to tur n
o your system using the power button.

RESET (Reset B utton):
Connec t to the reset button on the chassi s front panel. Press the reset button to restart the
computer if the computer f reezes and fails to per form a normal restar t.

PLED (Syste m Power LED):
Connec t to the power status indicator on th e chassis front panel . e LED is on when the
system is operating. e LED k eeps blinking when the system is in S1/S3 sleep state. e
LED is o when the system is in S4 slee p state or powered o (S5).

HDLED (Ha rd Drive Activity LED):
Connec t to the hard drive ac tivity LED on the chassis front panel. e LED is on when the
hard drive is reading or wr iting data.

e front panel de sign may dier by chassis. A front panel module mainly con sists of power
button, reset button , power LED, hard dr ive activity LED, speaker and etc. When connect­ing your ch assi s front panel module to thi s header, make sure the wire a ssignments and the
pin assignments are matched correctly.

1

PLED+

PLED-

HDLED-

HDLED+

PWRBTN#

GND

RESET#

GND

GND

Connect the power

button, reset button and

system status indicator on

the chassis to this header

according to the pin

assignments below. Note

the positive and negative

pins before connecting

the cables.

27

English

Power LED and Speaker

1

+5V

DUMMY

PLED+

PLED+

PLED-

DUMMY

SPEAKER

DUMMY

GND

GND

P+

P-

USB_PWR

P+

P-

USB_PWR

1

1

Header

(7-pin SPK_PLED1)

(see p.7, No. 18)

Please connect the

chassis power LED and

the chassis speaker to this

header.

Serial ATA3 Connectors

(SATA3_1:

see p.7, No. 12)

(SATA3_ 2:

see p.7, No. 11)

(SATA3_ 3:

see p.7, No. 14)

(SATA3_4:

see p.7, No. 13)

(SATA3_ 5:

see p.7, No. 15)

(SATA3_6:

see p.7, No. 16)

USB 2.0 Headers

(9-pin USB_3_4)

(see p.7, No. 23)

(9-pin USB_5_6)

(see p.7, No. 24)

USB 3.2 Gen1 Headers

(19-pin F_USB3_1_2)

(see p.7, No. 10)

Vbus

IntA_PA_SSRX-

IntA_PA_SSRX+

GND

IntA_PA_SSTX-

IntA_PA_SSTX+

GND

IntA_PA_D-

IntA_PA_D+

SATA3_1

SATA3_4

SATA3_6

SATA3_2

SATA3_3

SATA3_5

VbusVbus

IntA_PB_SSRX-

IntA_PB_SSRX+

GND

IntA_PB_SSTX-

IntA_PB_SSTX+

GND

IntA_PB_D-

IntA_PB_D+

Dummy

ese six SATA3

connectors support SATA

data cables for internal

storage devices with up to

6.0 Gb/s data transfer rate.

* M2_ 2 and SATA3_5_6

share lanes. If either one

of them is in use, the other

one will be disabled.

ere are two headers

on this motherboard.

Each USB 2.0 header can

support two ports.

ere are two headers on

this motherboard. Each

USB 3.2 Gen1 header can

support two ports.

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28

B550M Steel Legend

J_SENSE

OUT2_L

1

MIC_RET

PRESENCE#

GND

OUT2_R

MIC2_R

MIC2_L

OUT_RET

GND

1

1

IntA_P_D+

IntA_P_SSRX-

(19-pin F_USB3_3_4)

(see p.7, No. 19)

Front Panel Audio Header

(9-pin HD_ AUDIO1)

(see p.7, No. 30)

IntA_P_D-

IntA_P_D+

ID

GND

IntA_P_SSTX+

GND

IntA_P_D-

IntA_P_SSTX-

GND

IntA_P_SSRX+

GND

IntA_P_SSTX-

IntA_P_SSTX+

IntA_P_SSRX-

Vbus

Vbus

IntA_P_SSRX+

is header is for

connecting audio devices

to the front audio panel.

1. High Denition Audio support s Jack Sensing, but the panel wire on the chassis mu st sup­port HDA to function correctly. Please follow the in struction s in our manual and chassis
manual to install your system.

2. If you use an AC’97 audio panel , please install it to the front panel audio header by the
steps below:
A. Connect Mic_ IN (MIC) to MIC2_ L.
B. Conne ct Audio_R (RIN) to OUT2_R and Audio_ L (LIN) to OUT2_ L.
C. Connect Ground (GND) to Ground (GND).
D. MIC_ RET and OUT_RET are for the HD audio panel only. You don’t need to connect
them for the AC’97 audio panel .
E. To activate the front mic, go to the “FrontMic” Tab in the Realtek Control panel and
adjust “Recording Volume”.

Chassis Water Pump Fan

Connectors

(4-pin CHA_FAN1/WP)

(see p.7, No. 31)

2
3
4

FAN_VOLTAGE

CHA_FAN_SPEED

FAN_SPEED_CONTROL

is motherboard

provides four 4-Pin water

cooling chassis fan

connectors. If you plan to

connect a 3-Pin

chassis

water cooler fan, please

connect it to Pin 1-3.

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29

(4-pin CHA_FAN2/WP)

GND

1 2 3 4

4 3 2 1

D

F

(see p.7, No. 25)

(4-pin CHA_FAN3/WP)

(see p.7, No. 26)

(4-pin CHA_FAN4/WP)

(see p.7, No. 20)

FAN_VOLTAGE

FAN_SPEED

FAN_SPEED_CONTROL

CPU Fan Connector

(4-pin CPU_FAN1)

(see p.7, No. 3)

CPU Water Pump Fan

Connector

(4-pin CPU_FAN2/WP)

(see p.7, No. 4)

ATX Power Connector

(24-p in ATXPWR1)

(see p.7, No. 9)

GND

FAN_VOLTAGE

CPU_F

AN_SPEED

FAN_SPEED_CONTROL

AN_SPEED_CONTROL

CHA_FAN_SPEED

12

1

4 3 2 1

+12V

GN

24

13

is motherboard pro-

vides a 4-Pin CPU fan

(Quiet Fan) connector.

If you plan to connect a

3-Pin CPU fan, please

connect it to Pin 1-3.

is motherboard

provides a 4-Pin water

cooling CPU fan

connector. If you plan

to connect a 3-Pin CPU

water cooler fan, please

connect it to Pin 1-3.

is motherboard pro-

vides a 24-pin ATX power

connector. To use a 20-pin

ATX power supply, please

plug it along Pin 1 and Pin

13.

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30

B550M Steel Legend

1

SPI_DQ3

#

4

1

8 5

ATX 12V Power

Connector

(8-pin ATX12V1)

(see p.7, No. 1)

ATX 12V Power

Connector

(4-pin ATX12V2)

(see p.7, No. 2)

SPI TPM Header

(13 -pi n SPI_TPM _J1)

(see p.7, No. 22)

+3.3V

SPI_CS0

SPI_DQ2

Dummy

CLK

RSMRST#

SPI_MISO

SPI_MOSI

RST#

TPM_PIRQ

SPI_TPM_CS

GND

is motherboard

provides an 8-pin ATX

12V power connector. To

use a 4-pin ATX power

supply, please plug it along

Pin 1 and Pin 5.

*Warning: Please make

sure that the power cable

connected is for the CPU

and not the graphics

card. Do not plug the

PCIe power cable to this

connector.

Please connect an ATX

12V power supply to this

connector.

*e power supply plug

ts into this connector in

only one orientation.

is connector supports SPI

Trusted Platform Module (TPM)

system, which can securely store

keys, digital certicates, pass-

words, and data. A TPM system

also helps enhance network

security, protects digital

identities, and ensures platform

integrity.

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31

RGB LED Headers

D

1

1

1

DO_ADDR

1

(4-p in RGB_LED1)

(see p.7, No. 7)

(4-pi n RGB _LED2)

(see p.7, No. 29)

B

R

G

12V

12V GRB

ese two RGB headers are used

to connect RGB LED extension

cable which allows

users to choose from various LED

lighting eects.

Caution: Never install the RGB

LED cable in the wrong orienta-

tion; otherwise, the cable may

be damaged.

*Please refer to page 58 for

further instructions on these two

headers.

English

Addressable LED Headers

(3-pin A DDR_LE D1)

(see p.7, No. 8)

(3-pin A DDR_LE D2)

(see p.7, No. 28)

VOUT

VOUT

GND

DO_ADDR

ese two

are used to connect

Addressable

Addressable

headers

LED extension cable which

allows users to choose from

various LED lighting eects.

Caution: Never install the

Addressable LED cable in the

GN

wrong orientation; otherwise,

the cable may be damaged.

*Please refer to page 59 for

further instructions on this

header.

32

2.7 Clear CMOS Button

e motherboard has a Clear CMOS Button, allowing users to quickly clear the

CMOS values.

B550M Steel Legend

Clear CMOS Button

(CLRCBTN 1)

(see p.9, No. 17)

is function i s workable only when you power o your computer and unplug the power
supp ly.

Clear CMOS Button

allows users to quickly

clear the CMOS values.

33

English

2.8 Post Status Checker

Post Status Checker (PSC) diagnoses the computer when users power on the

machine. It emits a red light to indicate whether the CPU, memory, VGA or stor-

age is dysfunctional. e lights go o if the four mentioned above are functioning

normally.

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34

B550M Steel Legend

2.9 CrossFireXTM and Quad CrossFireXTM Operation Guide

is motherboard supports CrossFireXTM and Quad CrossFireXTM that allows you

to install up to two identical PCI Express x16 graphics cards.

1. You should only use identical CrossFireXTM-ready g raphics cards that are AM D

certied.

2. Make sure that your graphics card driver support s AMD CrossFireXTM technology.

Download the drivers f rom the AMD’s website: www.amd.com

3. Make sure that your power supply unit (PSU) can pro vide at l east the minimum

power your syste m require s. It is recommended to use a AMD ce rtied PSU. Please
refer to the AMD’s website for details.

4. If you pair a 12-pipe CrossFireXTM Edition card with a 16-pipe card, both cards will

operate a s 12-pipe cards while in CrossFireXTM mode.

5. Dierent CrossFireXTM cards may require dierent method s to enable CrossFi-

reXTM. Please refer to A MD graphics card manuals for detailed installation guide .

2.9.1 Installing Two CrossFireXTM-Ready Graphics Cards

CrossFire Bridge

Step 1

Insert one graphics card into PCIE1 slot

and the other graphics card to PCIE3 slot.

Make sure that the cards are properly

seated on the slots.

Step 2

Connect two graphics cards by installing

a CrossFire Bridge on the CrossFire Bridge

Interconnects on the top of the graphics

cards. (e CrossFire Bridge is provided

with the graphics card you purchase, not

bundled with this motherboard. Please

refer to your graphics card vendor for

deta ils .)

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35

Step 3

Connect a VGA/DVI/DP/HDMI cable

from the monitor to the corresponding

port on the graphics card installed to the

PCIE1 slot.

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36

2.9.2 Driver Installation and Setup

Step 1

Power on your computer and boot into OS.

Step 2

Remove the AMD drivers if you have any VGA drivers installed in your system.

e Catalyst Uninstalle r is an optional downloa d. We recommend using this utility
to uninstall any previously installed Catalyst drive rs prior to installation. Please
check A MD’s website for AMD driver updates.

Step 3

Install the required drivers and CATALYST Control Center then restart your

computer. Please check AMD’s website for details.

Step 4

Double-click the AMD Catalyst Control

AMD Catalyst Control Center

Center icon in the Windows® sy stem tray.

B550M Steel Legend

Step 5

In the le pane, click Performance and

then AMD CrossFireXTM. en select

Enable AMD CrossFireX and click Apply.

Select the GPU number according to your

graphics card and click Apply.

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37

2.10 M.2 WiFi/BT Module Installation Guide (M2_3)

e M.2, also known as the Next Generation Form Factor (NGFF), is a small size and

versatile card edge connector that aims to replace mPCIe and mSATA. e M.2 Socket (Key

E) supports type 2230 WiFi/BT module.

* e M.2 socket does not support SATA M.2 SSDs.

Installing the WiFi/BT module

Step 1

Prepare a type 2230 WiFi/BT module

and the screw.

Step 2

Find the nut location to be used.

PCB Length: 3cm
Module Type: Type2230

English

38

A

Step 3

Gently insert the WiFi/BT module

into the M.2 slot. Please be aware

that the module only ts in one

orientation.

A

o

A

20

B550M Steel Legend

Step 4

Tighten the screw with a screwdriver

to secure the module into place.

Please do not overtighten the screw as

this might damage the module.

A

39

English

2.11 M.2_SSD (NGFF) Module Installation Guide (M2_1)

The M.2, a lso known as the Next Generation Form Factor (NGFF), is a small size and

versatile card edge connector that aims to replace mPCIe and mSATA.

e Hyper M.2 Socket (M2_1) supports M Key type 2280 M.2 PCI Express module up to

Gen4x4 (64 Gb/s) (with Matisse) or Gen3x4 (32 Gb/s) (with Renoir).

Installing the M.2_SSD (NGFF) Module

Step 1

Prepare a M.2_SSD (NGFF) module

and the screw.

Step 2

Depending on the PCB type and

length of your M.2 _SSD (NGFF)

module, nd the corresponding nut

location to be used.

English

40

No. 1

Nut Location A

PCB Length 8cm

Module Type Type228 0

Step 3

B550M Steel Legend

1

2

Before installing a M.2 (NGFF) SSD

module, please loosen the screws to

remove the M.2 heatsink.

*Please remove the protective lms

on the bottom side of the M.2

1

heatsink before you install a M.2

SSD module.

Step 4

Align and gently insert the M.2

(NGFF) SSD module into the M.2

slot. Please be aware that the M.2

(NGFF) SSD module only ts in one

orientation.

A

A

o

20

Step 5

Tighten the screw with a screwdriver

to secure the module into place.

Please do not overtighten the screw

NUT1NUT2

as this might damage the module.

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41

M.2_SSD (NGFF) Module Support List (M2_1)

Vendor Interface P/N

ADATA PCIe3 x4 ASX7000NP-128GT-C
ADATA PCIe3 x4 ASX8000NP-256GM-C
ADATA PCIe3 x4 ASX7000NP-256GT-C
ADATA PCIe3 x4 ASX8000NP-512GM-C
ADATA PCIe3 x4 ASX7000NP-512GT-C
Apacer PCIe3 x4 AP240GZ280
Corsair PCIe3 x4 CSSD-F240GBMP500
Intel PCIe3 x4 SSDPEKKF256G7
Intel PCIe3 x4 SSDPE KKF512G7
Kingston PCIe3 x4 SKC1000/480G
Kingston PCIe2 x4 SH2280S3/480G
OCZ PCIe3 x4 RVD400-M2280-512G (NVME)
PAT R IOT PCIe3 x4 PH240GPM280SSDR NVME
Plextor PCIe3 x4 PX-128M8PeG
Plextor PCIe3 x4 PX-1TM8PeG
Plextor PCIe3 x4 PX-256M8PeG
Plextor PCIe3 x4 PX-512M8PeG
Plextor PCIe PX-G256M6e
Plextor PCIe PX-G512M6e
Samsung PCIe3 x4 SM961 MZVPW128HEGM (NVM)
Samsung PCIe3 x4 PM961 MZVLW128HEGR (NVME)
Samsung PCIe3 x4 960 EVO (MZ-V6E250) (NVME)
Samsung PCIe3 x4 960 EVO (MZ-V6E250BW) (NVME)
Samsung PCIe3 x4 SM951 (NV ME)
Samsung PCIe3 x4 SM951 (MZHPV256HDGL)
Samsung PCIe3 x4 SM951 (M ZHPV512HDGL)
Samsung PCIe3 x4 SM951 (NV ME)
Samsung PCIe x4 XP941-512G (MZHPU512HCGL)
SanDisk PCIe SD6 PP4 M-128G
SanDisk PCIe SD6PP4M-256G
TEAM PCIe3 x4 TM8FP224 0G0C101
TEAM PCIe3 x4 TM8FP2480GC110
WD PCIe3 x4 WDS256G1X0C-00ENX0 (NVME)
WD PCIe3 x4 WDS512G1X0 C-0 0E NX0 (NVME)

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42

For the latest updates of M.2_SSD (NFGG) module support list, please visit our website for

details: http://www.asrock.com

B550M Steel Legend

2.12 M.2_SSD (NGFF) Module Installation Guide (M2_2)

The M.2, a lso known as the Next Generation Form Factor (NGFF), is a small size and

versatile card edge connector t hat aims to replace mPCIe and mSATA. e M.2 Socket

(M2_2) suppor ts M Key ty pe 2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express

module up to Gen3 x2 (16 Gb/s).

* M2_ 2 and SATA3_5_6 share lanes. If either one of them is in use, the other one will be

disabled.

Installing the M.2_SSD (NGFF) Module

Step 1

Prepare a M.2_SSD (NGFF) module

and the screw.

Step 2

Depending on the PCB type and

length of your M.2 _SSD (NGFF)

module, nd the corresponding nut

location to be used.

No. 1

Nut Location A

PCB Length 8cm

Module Type Type228 0

English

43

Step 3

Align and gently insert the M.2

(NGFF) SSD module into the M.2

slot. Please be aware that the M.2

(NGFF) SSD module only ts in one

orientation.

A

English

A

o

20

Step 4

Tighten the screw with a screwdriver

to secure the module into place.

Please do not overtighten the screw

as this might damage the module.

NUT1NUT2

44

M.2_SSD (NGFF) Module Support List (M2_2)

Vendor Interface P/N

ADATA SATA3 AXNS330E-32GM-B
ADATA SATA3 AXNS381E-128GM-B
ADATA SATA3 AXNS381E-256GM-B
ADATA SATA3 ASU800NS38-256GT-C
ADATA SATA3 ASU800NS38-512GT-C
Crucial SATA3 CT120M500SSD4
Crucial SATA3 CT240M500SSD4
Intel SATA3 Intel SSDSCKGW080A401/80G
Kingston SATA3 SM2280S3
Plextor PCIe PX-G256M6e
Plextor PCIe PX-G512M6e
Samsung PCIe x4 XP941-512G (MZHPU512HCGL)
SanDisk PCIe SD6PP4M-128G
SanDisk PCIe SD6PP4M-256G
Team SATA3 TM4PS4128GMC105
Team SATA3 TM4 PS 4256 GMC105
Team SATA3 TM8PS4128GMC105
Team SATA3 TM8PS4256GMC105
Tra nscend SATA3 TS256GMTS400
Tra nscend SATA3 TS512GMTS600
Tra nscend SATA3 TS512GMTS800
V-Col or SATA3 VLM100-120G-2280B-RD
V-Col or SATA3 VL M10 0-24 0G-2280RGB
V-Col or SATA3 VSM100 -240G-2280
V-Col or SATA3 VL M10 0-24 0G-2280B -R D
WD SATA3 WDS100T1B0B-00AS40
WD SATA3 WDS240G1G0B-00RC30

B550M Steel Legend

For the latest updates of M.2_SSD (NFGG) module support list, please visit our website for

details: http://www.asrock.com

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45

Chapter 3 Software and Utilities Operation

3.1 Installing Drivers

e Support CD that comes with the motherboard contains necessary drivers and

useful utilities that enhance the motherboard’s features.

Running The Support CD

To begin using the support CD, insert the CD into your CD-ROM drive. e CD

automatically displays the Main Menu if “AUTORUN” is enabled in your computer.

If the Main Menu does not appear automatically, locate and double click on the le

“ASRSETUP.EXE” in the Support CD to display the menu.

Drivers Menu

e drivers compatible to your system will be auto-detected and listed on the

support CD driver page. Please click Install All or follow the order from top to

bottom to install those required drivers. erefore, the drivers you install can work

properly.

Utilities Menu

e Utilities Menu shows the application soware that the motherboard supports.

Click on a specic item then follow the installation wizard to install it.

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46

B550M Steel Legend

3.2 ASRock Motherboard Utility (A-Tuning)

ASRock Motherboard Utility (A-Tuning) is ASRock’s multi purpose soware suite

with a new interface, more new features and improved utilities.

3.2.1 Installing ASRock Motherboard Utility (A-Tuning)

ASRock Motherboard Utility (A-Tuning) can be downloaded from ASRock Live

Update & APP Shop. Aer the installation, you will nd the icon “ASRock Mother-

board Utility (A-Tuning)“ on your desktop. Double-click the

“ASRock Motherboard Utility (A-Tuning)“ icon, ASRock Motherboard Utility

(A-Tu n i ng) main menu will pop up.

3.2.2 Using ASRock Motherboard Utility (A-Tuning)

ere are ve sections in ASRock Motherboard Utility (A-Tuning) main menu:

Operation Mode, OC Tweaker, System Info, FAN-Tastic Tuning and Settings.

Operation Mode

Choose an operation mode for your computer.

47

English

OC Tw eaker

Congurations for overclocking the system.

System Info

View information about the system.

*e System Browser tab may not appear for certain models.

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48

B550M Steel Legend

FAN-Tastic Tuning

Congure up to ve dierent fan speeds using the graph. e fans will automatically shi

to the next speed level when the assigned temperature is met.

Settings

Congure ASRock ASRock Motherboard Utilit y (A-Tuning). Click to select "Auto

run at Windows Startup" if you want ASRock Motherboard Utility (A-Tuning) to

be launched when you start up the Windows operating system.

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49

3.3 ASRock Live Update & APP Shop

e ASRock Live Update & APP Shop is an online store for purchasing and

downloading soware applications for your ASRock computer. You can quickly and

easily install various apps and support utilities. With ASRock Live Update & APP

Shop, you can optimize your system and keep your motherboard up to date simply

with a few clicks.

Double-click on your desktop to access ASRock Live Update & APP Shop
utility.

*You need to be connected to the Internet to download apps from the ASRock Live Update & APP Shop.

3.3.1 UI Overview

Category Panel

Hot News

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50

Information Panel

Category Panel: e category panel contains several category tabs or buttons that

when selected the information panel below displays the relative information.

Information Panel: e information panel in the center displays data about the

currently selected category and a llows users to perform job-related tasks.

Hot News: e hot news section displays the various latest news. Click on the image

to visit the website of the selected news and k now more.

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3.3.2 Apps

When the "Apps" tab is selected, you will see all the available apps on screen for you

to download.

Installing an App

Step 1

Find the app you want to install.

e most recommended app appears on the le side of the screen. e other various

apps are shown on the right. Please scroll up and down to see more apps listed.

You can check the price of the app and whether you have already intalled it or not.

- e red icon displays the price or "Free" if the app is free of charge.

- e green "Installed" icon means the app is installed on your computer.

Step 2

Click on the app icon to see more details about the selected app.

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Step 3

If you want to install the app, click on the red icon to start downloading.

Step 4

When installation completes, you can nd the green "Installed" icon appears on the

upper right corner.

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To uninstall it, simply click on the trash can icon .
*e trash icon may not appear for certain apps.

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Upgrading an App

You can only upgrade the apps you have already installed. When there is an

available new version for your app, you will nd the mark of "New Version"

appears below the installed app icon.

Step 1

Click on the app icon to see more details.

Step 2

Click on the yellow icon to start upgrading.

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3.3.3 BIOS & Drivers

Installing BIOS or Drivers

When the "BIOS & Drivers" tab is selected, you will see a list of recommended or

critical updates for the BIOS or drivers. Please update them all soon.

Step 1

Please check the item information before update. Click on to see more details.

Step 2

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Click to select one or more items you want to update.

Step 3

Click Update to start the update process.

B550M Steel Legend

3.3.4 Setting

In the "Setting" page, you can change the language, select the server location, and

determine if you want to automatically run the ASRock Live Update & APP Shop

on Windows startup.

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3.4 Nahimic Audio

Nahimic audio soware provides an incredible high denition sound technology which

boosts the audio and voice performance of your system. Nahimic Audio interface is

composed of four tabs: Audio, Microphone, Sound Tracker and Settings.

ere are four functions in Nahimic audio :

No. Function Description

From this tab, you can mute the current audio device, choose

Audio

1

between four factory audio proles, turn all audio eects
on/o, restores the current prole to its default settings and
access Surround Sound and various features.

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Microphone

2

3

4

Sound

Tracker

Settings

From this tab, you can mute the current mic device, choose
between two factory mic proles, turn/o all microphone
eects, restore the current prole to its default settings, and
access Static Noise Suppression and various features.

e Sound Tracker provides a visual indication localizing
the sources of the sounds while in a game. ese are
represented by dynamic segments pointing the direction
of the sounds: the more opaque they are, the stronger the
sounds are.

From this tab, you can access all settings and information of
the soware.

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1

1

3.5 ASRock Polychrome SYNC

ASRock Polychrome SYNC is a lighting control utility specically designed for unique indi-

viduals with sophisticated tastes to build their own stylish colorful lighting system. Simply by

connecting the LED strip, you can customize various lighting schemes and patterns, including

Static, Breathing, Strobe, Cycling, Music, Wave and more.

Connecting the LED Strip

Connect your RGB LED strips to the

motherboard.

RGB LED Headers (RGB_LED1, RGB_LED2)

RGB_LED1

B

R

G

12V

1

B

R

G

V

2

1

on the

RGB_LED2

12V GRB

1. Never insta ll the RGB LED cable in the wrong orientation; otherwise, the cable may be
damaged.

2. Before installing or re moving your RGB LED cable, please power o your system and
unplug the power cord from the power supply. Failure to do so may cause damages to
motherboard components.

1. Please note that the RGB LED strips do not come with the package.

2. e RGB LED header suppor ts standard 5050 RGB LED str ip (12V/G/R/B), with a

maximum power rating of 3A (12V) and length within 2 meters.

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Connecting the Addressable RGB LED Strip

D

1

DO_ADDR

1

Connect your

ADDR _LED2)

Addressable RGB LED

on the motherboard.

strips to the

Addressable LED Headers (ADDR_LED1,

ADDR_LED1

VOUT

GND

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ADDR_LED2

DO_ADDR

VOUT

1

GN

1. Never insta ll the RGB LED cable in the wrong orientation; otherwise, the cable may be
damaged.

2. Before installing or re moving your RGB LED cable, please power o your system and
unplug the power cord from the power supply. Failure to do so may cause damages to
motherboard components.

1. Please note that the RGB LED strips do not come with the package.

2. e RGB LED header suppor ts WS2812B addressable RGB LED strip (5V/Data/

GND), with a ma ximum power rating of 3A (5V) and length within 2 meters.

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B550M Steel Legend

ASRock Polychrome SYNC Utility

Now you can adjust the RGB LED color through the ASRock Polychrome SYNC Utility.

Download this utility from the ASRock Live Update & APP Shop and start coloring your

PC style your way!

Drag the tab to customize your

preference.

Toggle on/o the

RGB LED switch

Sync RGB LED eects

for all LED regions of

the motherboard

Select a RGB LED light eect

from the drop-down menu.

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Chapter 4 UEFI SETUP UTILITY

4.1 Introduction

is section explains how to use the UEFI SETUP UTILITY to congure your

system. You may run the UEFI SETUP UTILITY by pressing <F2> or <Del> right

aer you power on the computer, otherwise, the Power-On-Self-Test (POST) will

continue with its test routines. If you wish to enter the UEFI SETUP UTILITY aer

POST, restart the system by pressing <Ctl> + <Alt> + <Delete>, or by pressing the

reset button on the system chassis. You may also restart by turning the system o

and then back on.

Becau se the UEFI soware is constantly being updated, the following UEFI setup
screens and de scriptions are for refe rence purpose only, and the y may not exactly
match what you see on your screen.

4.1.1 UEFI Menu Bar

e top of the screen has a menu bar with the following selections:

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Main

OC Tweaker

Advanced

Tool

H/W Monitor

Security

Boot

Exit

For setting system time/date information

For overclocking congurations

For advanced system congurations

Useful tools

Displays current hardware status

For security settings

For conguring boot settings and boot priority

Exit the current screen or the UEFI Setup Utility

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4.1.2 Navigation Keys

Use < > key or < > key to choose among the selections on the menu bar, and

use < > key or < > key to move the cursor up or down to select items, then

press <Enter> to get into the sub screen. You can also use the mouse to click your

required item.

Please check the following table for the descriptions of each navigation key.

Navigation Key(s) Description

+ / -

<Tab>

<PGUP>

<PGDN>

<HOME>

<END>

<F1>

<F7>

<F9>

<F10>

<F12>

<ESC>

To change option for the selected items

Switch to next function

Go to the previous page

Go to the next page

Go to the top of the screen

Go to the bottom of the screen

To display the General Help Screen

Discard changes and exit the SETUP UTILITY

Load optimal default values for all the settings

Save changes and exit the SETUP UTILITY

Print screen

Jump to the Exit Screen or exit the current screen

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4.2 Main Screen

When you enter the UEFI SETUP UTILITY, the Main screen will appear and

display the system overview.

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4.3 OC Tweaker Screen

In the OC Tweaker screen, you can set up overclocking features.

B550M Steel Legend

Becau se the UEFI soware is constantly being updated, the following UEFI setup
screens and de scriptions are for refe rence purpose only, and the y may not exactly
match what you see on your screen.

Overclock Mode(Bus Speed)

Select the overclock mode. Warning! When overclocking also the PCIe, PCI, SATA and

USB busses will be overcloked which may cause instability or failure. Please install an

operating system and the drivers required before overclocking, or else your HDD's may be

undetectable. Overclocking is not supported if the monitor is connected via the onboard

D-Bus/VGA connector.

CPU Frequency and Voltage(VID) Change

If this item is set to [Manual], the multiplier and voltage will be set based on user selection.

Final result is depending on the CPU's capability.

CPU Core (Per CCX)

CPU Voltage

Species a custom CPU core voltage (mV), Should be combined with a custom CPU core

frequency. Power saving features for idle cores (e.g. cc6 sleep) remain active.

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CCD0

CCX0 Frequency (MHz)

Use this item to adjust CCX0 Frequency.

CCX1 Frequency (MHz)

Use this item to adjust CCX1 Frequency.

CCD1

CCX0 Frequency (MHz)

Use this item to adjust CCX0 Frequency.

CCX1 Frequency (MHz)

Use this item to adjust CCX1 Frequency.

SoC/Uncore OC Voltage(VID)

Specify the SoC/Uncore voltage (VDD_SOC) in mV to support memory and Innity Fabric

overclocking. VDD_SOC also determines the GPU voltage on processors with integrated

graphics. “SoC/Uncore OC Mode” needs to be enabled to force this voltage.

CLD0 VDDP Voltage Control

AMD Overclocking Setup VDDP is a voltage for the DDR4 bus signaling (PHY), and it is

derived from your DRAM Voltage (VDDIO_Mem). As a result, VDDP voltage in mV can

approach but not exceed your DRAM Voltage.

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CLD0 VDDG CCD Voltage Control

AMD Overclocking Setup VDDG CCD represents voltage for the data portion of the Innity

Fabric. It is derived from the CPU SoC/Uncore Voltage (VDD_SOC). VDDG can approach

but not exceed VDD_SOC.

CLD0 VDDG IOD Voltage Control

AMD Overclocking Setup VDDG IOD represents voltage for the data portion of the Innity

Fabric. It is derived from the CPU SoC/Uncore Voltage (VDD_SOC). VDDG can approach

but not exceed VDD_SOC.

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DRAM Information

Load XMP Setting

Load XMP settings to overclock the memory and perform beyond standard

specications.

DRAM Frequency

If [Auto] is selected, the motherboard will detect the memory module(s) inserted

and assign the appropriate frequency automatically. Setting DRAM Frequency can

adjust DRAM Timing.

DRAM Voltage

Congure the voltage for the DRAM Voltage.

Innity Fabric Frequency and Dividers

AMD Overclocking Setup Set Innity Fabric frequency (FCLK). Auto: FCLK =

MCLK. Manual: FCLK must be less than or equal to MCLK for best performance in

most cases. Latency penalties are incurred if FCLK and MCLK are mismatched, but

suciently high MCLK can negate or overcome this penalty.

DRAM Timing Conguration

External Voltage Settings and Load-line Calibration

CPU Vcore Voltage

Input voltage for the processor by the external voltage regulator.

CPU Load-Line Calibration

CPU Load-Line Calibration helps prevent CPU voltage droop when the system is

under heav y loading.

VDDCR_SOC Voltage

Input voltage for the processor by the external voltage regulator.

VDDCR_SOC Load-Line Calibration

VDDCR_SOC Load-Line Calibration helps prevent VDDCR _SOC voltage droop

when the system is under heavy loading.

VPPM

Congure the voltage for the VPPM.

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CPU VDD 1.8V Voltage

Congure the voltage for the CPU VDD 1.8V Voltage. e default value is [Auto].

Save User Default

Type a prole name and press enter to save your settings as user default.

Load User Default

Load previously saved user defaults.

Save User UEFI Setup Prole to Disk

It helps you to save current UEFI settings as an user prole to disk.

Load User UEFI Setup Prole from Disk

You can load previous saved prole from the disk.

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B550M Steel Legend

4.4 Advanced Screen

In this section, you may set the congurations for the following items: CPU

Conguration, Onboard Devices Conguration, Storage Conguration, ACPI Con-

guration, Trusted Computing, AMD CBS, AMD PBS and AMD Overclocking.

Setting wrong values in this sec tion may cause the system to malfunction.

UEFI Conguration

Active Page on Entry

Select the default page when entering the UEFI setup utility.

Full HD UEFI

When [Auto] is selected, the resolution will be set to 1920 x 1080 if the monitor

supports Full HD resolution. If the monitor does not support Full HD resolution,

then the resolution will be set to 1024 x 768. When [Disable] is selected, the

resolution will be set to 1024 x 768 directly.

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4.4.1 CPU Conguration

PSS Support

Use this to enable or disable the generation of ACPI_PPC, _PSS, and _PCT objects.

NX Mode

Use this to enable or disable NX mode.

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SVM Mode

When this is set to [Enabled], a VMM (Virtual Machine Architecture)can utilize the

additional hardware capabilities provided by AMD-V. e default value is [Enabled].

Coniguration options: [Enabled] and [Disabled].

SMT Mode

is item can be used to disable symmetric multithreading. To re-enable SMT, a

power cycle is needed aer selecting [Auto].

Warning: S3 is not supported on systems where SMT is disabled.

AMD fTPM Switch

Use this to enable or disable AMD CPU fTPM.

B550M Steel Legend

4.4.2 Onboard Devices Conguration

Turn On LED in S5

Turn on LED in the ACPI S5 state.

SR-IOV Support

Enable/disable the SR-IOV (Single Root IO Virtualization Support) if the system

has SR-IOV capable PCIe devices.

UMA Frame buer Size

is item allows you to set the size of the UMA frame buer.

(Only for processor with integrated graphics)

Gnb HD Audio

Enable/disable onboard HD audio. Set to Auto to enable onboard HD audio and

automatically disable it when a sound card is installed.

Front Panel

Enable/disable front panel HD audio.

Restore on AC/Power Loss

Select the power state aer a power failure. If [Power O] is selected, the power will

remain o when the power recovers. If [Power On] is selected, the system will start

to boot up when the power recovers.

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WAN Radio

Congure the WiFi module's connectivity.

BT On/O

Enable/disable the bluetooth.

PS2 Y- Cable

Enable the PS2 Y-Cable or set this option to Auto.

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4.4.3 Storage Conguration

SATA M o de

AHCI: Supports new features that improve performance.

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RAID: Combine multiple disk drives into a logical unit.

SATA Hot Plug

Enable/disable the SATA Hot Plug function.

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4.4.4 ACPI Conguration

Suspend to RAM

It is recommended to select auto for ACPI S3 power saving.

Deep Sleep

Congure deep sleep mode for power saving when the computer is shut down.

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PS/2 Keyboard S4/S5 Wakeup Support

Allow the system to be waked up by a PS/2 Keyboard in S4/S5.

USB Keyboard/Mouse Power On

Allow the system to be waked up by an USB Keyboard/Mouse device.

PCIE Devices Power On

Allow the system to be waked up by a PCIE device and enable wake on LAN.

RTC Alarm Power On

Allow the system to be waked up by the real time clock alarm. Set it to By OS to let

it be handled by your operating system.

USB Power Delivery in Soft O State (S5)

If this option is enabled, the USB port will provide power to your devices even when

the system is in Power State S5.

4.4.5 Trusted Computing

Security Device Support

Enable or disable BIOS support for security device.

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4.4.6 AMD CBS

e AMD CBS menu accesses AMD specic features.

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4.4.7 AMD PBS

e AMD PBS menu accesses AMD specic features.

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English

4.4.8 AMD Overclocking

e AMD Overclocking menu accesses options for conguring CPU frequency and

voltage.

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B550M Steel Legend

4.5 Tools

Easy RAID Installer

Easy R AID Installer helps you to copy the RAID driver from the support CD to

your USB storage device. Aer copying the drivers please change the SATA mode to

RAID, then you can start installing the operating system in RAID mode.

SSD Secure Erase Tool

Use this tool to securely erase SSD.

NVME Sanitization Tool

Aer you sanitize SSD, all user data will be permantly destroyed on the SSD and

cannot be recovered.

Instant Flash

Save UEFI les in your USB storage device and run Instant Flash to update your

UEFI.

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4.6 Hardware Health Event Monitoring Screen

is section allows you to monitor the status of the hardware on your system,

including the parameters of the CPU temperature, motherboard temperature, fan

speed and voltage.

CPU FAN1 Setting

Select a fan mode for CPU Fan 1, or choose Customize to set 5 CPU temperatures

and assign a respective fan speed for each temperature.

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CPU FAN1 Temp Source

Select a fan temperature source for CPU Fan 1.

FAN Conguration

CPU_FAN2/WP Switch

Select CPU Water Pump mode.

CPU Fan 2 Control Mode

Select PWM mode or DC mode for CPU Fan 2 .

CPU Fan 2 Setting

Select a fan mode for CPU Fan 2, or choose Customize to set 5 CPU temperatures

and assign a respective fan speed for each temperature.

B550M Steel Legend

CPU Fan 2 Temp Source

Select a fan temperature source for CPU Fan 2.

CHA_FAN1/WP Switch

Select CHA_FAN1 or Water Pump mode.

Chassis Fan 1 Control Mode

Select PWM mode or DC mode for Chassis Fan 1 .

Chassis Fan 1 Setting

Select a fan mode for Chassis Fan 1, or choose Customize to set 5 CPU temperatures

and assign a respective fan speed for each temperature.

Chassis Fan 1 Temp Source

Select a fan temperature source for Chassis Fan 1.

CHA_FAN2/WP Switch

Select CHA_FAN2 or Water Pump mode.

Chassis Fan 2 Control Mode

Select PWM mode or DC mode for Chassis Fan 2 .

Chassis Fan 2 Setting

Select a fan mode for Chassis Fan 2, or choose Customize to set 5 CPU temperatures

and assign a respective fan speed for each temperature.

Chassis Fan 2 Temp Source

Select a fan temperature source for Chassis Fan 2.

CHA_FAN3/WP Switch

Select CHA_FAN3 or Water Pump mode.

Chassis Fan 3 Control Mode

Select PWM mode or DC mode for Chassis Fan 3 .

Chassis Fan 3 Setting

Select a fan mode for Chassis Fan 3, or choose Customize to set 5 CPU temperatures

and assign a respective fan speed for each temperature.

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Chassis Fan 3 Temp Source

Select a fan temperature source for Chassis Fan 3.

CHA_FAN4/WP Switch

Select CHA_FAN4 or Water Pump mode.

Chassis Fan 4 Control Mode

Select PWM mode or DC mode for Chassis Fan 4.

Chassis Fan 4 Setting

Select a fan mode for Chassis Fan 4, or choose Customize to set 5 CPU temperatures

and assign a respective fan speed for each temperature.

Chassis Fan 4 Temp Source

Select a fan temperature source for Chassis Fan 4.

Fan-Tastic

Select a fan mode for Fan, or choose Customize to set 5 CPU temperatures and assign a

respective fan speed for each temperature.

FanTuni ng

Detect the lowest fan speed in the system. Iy may take 3-5 minutes to complete.

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B550M Steel Legend

4.7 Security Screen

In this section you may set or change the supervisor/user password for the system.

You may also clear the user password.

Supervisor Password

Set or change the password for the administrator account. Only the administrator

has authority to change the settings in the UEFI Setup Utility. Leave it blank and

press enter to remove the password.

User Password

Set or change the password for the user account. Users are unable to change the

settings in the UEFI Setup Utility. Leave it blank and press enter to remove the

password.

Secure Boot

Enable to support Secure Boot.

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4.8 Boot Screen

is section displays the available devices on your system for you to congure the

boot settings and the boot priority.

Boot From Onboard LAN

Allow the system to be waked up by the onboard LAN.

Setup Prompt Timeout

Congure the number of seconds to wait for the setup hot key.

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Fast Boot

Fast Boot minimizes your computer's boot time. In fast mode you may not boot

from an USB storage device.

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CSM (Compatibility Support Module)

CSM

Enable to launch the Compatibility Support Module. Please do not disable unless

you’re running a WHCK test.

Launch PXE OpROM Policy

Select UEFI only to run those that support UEFI option ROM only. Select Legacy

only to run those that support legacy option ROM only. Select Do not launch to not

execute both legacy and UEFI option ROM.

Launch Storage OpROM Policy

Select UEFI only to run those that support UEFI option ROM only. Select Legacy

only to run those that support legacy option ROM only. Select Do not launch to not

execute both legacy and UEFI option ROM.

Bootup Num-Lock

Select whether Num Lock should be turned on or o when the system boots up.

Full Screen Logo

Enable to display the boot logo or disable to show normal POST messages.

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AddOn ROM Display

Enable AddOn ROM Display to see the AddOn ROM messages or congure the Ad-

dOn ROM if you’ve enabled Full Screen Logo. Disable for faster boot speed.

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B550M Steel Legend

4.9 Exit Screen

Save Changes and Exit

When you select this option the following message, “Save conguration changes

and exit setup?” will pop out. Select [OK] to save changes and exit the UEFI SETUP

UTILITY.

Discard Changes and Exit

When you select this option the following message, “Discard changes and exit

setup?” will pop out. Select [OK] to exit the UEFI SETUP UTILITY without saving

any changes.

Discard Changes

When you select this option the following message, “Discard changes?” will pop

out. Select [OK] to discard all changes.

Load UEFI BIOS Defaults

Load UEFI BIOS Default values for all the setup questions. e F9 key can be used

for this operation.

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Contact Information

If you need to contact ASRock or want to know more about ASRock, you’re welcome

to visit ASRock’s website at http://ww w.asrock.com; or you may contact your dealer

for further information. For technical questions, please submit a support request

form at https://event.asrock.com/tsd.asp

ASRock Incorporation

2F., No.37, Sec. 2, Jhongyang S. Rd., Beitou District,

Taipei City 112, Taiwan (R.O.C.)

ASRock EUROPE B.V.

Bijsterhuizen 11-11

6546 AR Nijmegen

e Netherlands

Phone: [phone]

Fax: [phone]

ASRock America, Inc.

13848 Magnolia Ave, Chino, CA91710

U.S.A.

Phone: [phone]

Fax: [phone]

DECLARATION OF CONFORMITY

Per FCC Part 2 Section 2.1077(a)

Responsible Party Name: ASRock Incorporation

Address:

Phone/FaxNo:

hereby declares that the product

Product Name : Motherboard

13848 Magnolia Ave, Chino, CA91710

[phone]/[phone]

Model Number :

Conforms to the following specications:

FCC Part 15, Subpart B, Unintentional Radiators

Supplementary Information:

B550M Steel Legend

is device complies with part 15 of the FCC Rules. Operation is subject to the

following two conditions: (1) is device may not cause harmful interference,

and (2) this device must accept any interference received, including interference

that may cause undesired operation.

James

Representative Person’s Name:

Signature :

Date :

May 12, 2017

EU Declaration of Conformity

EMC —Directive 2014/30/EU (from April 20th, 2016)

ڛ

☐

For the following equipment:

Motherboard

(Product Name)

B550M Steel Legend/ ASRock

(Model Designation / Trade Name)

ASRock Incorporation

(Manufacturer Name)

2F., No.37, Sec. 2, Jhongyang S. Rd., Beitou District, Taipei City 112, Taiwan (R.O.C.)

(Manufacturer Address)

☐ EN 55022:2010/AC:2011 Class B EN 55024:2010/A1:2015

ڛ EN 55032:2012+AC:2013 Class B ڛڛ EN 61000-3-3:2013
ڛ EN 61000-3-2:2014

☐

LVD —Directive 2014/35/EU (from April 20th, 2016)

EN 60950-1 : 2011+ A2: 2013 ☐

ڛ RoHS — Directive 2011/65/EU
ڛ CE marking

EN 60950-1 : 2006/A12: 2011

(EU conformity marking)

ASRock EUROPE B.V.

(Company Name)

Bijsterhuizen 1111 6546 AR Nijmegen e Netherlands

(Company Address)

Person responsible for making this declaration:

(Name, Surname)

A.V.P

(Position / Title)

May 27, 2020

(Date)

P/N: 15G062228000AK V1.0