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