Asrock B550M-ITX/ac User Manual

Version 1.0

Published June 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 possibility 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.

CE Warning

is device complies with directive 2014/53/EU issued by the Commision of the European
Community.

is equipment complies with EU radiation exposure limits set forth for an uncontrolled
environment.
is equipment should be installed and operated with minimum distance 20cm between
the radiator & your body.

Operations in the 5.15-5.35GHz band are restricted to indoor usage only.

Radio transmit power per transceiver ty pe

Function Frequency Maximum Output Power (EIRP)

2400-2483.5 MHz 18.5 + / -1.5 dbm

5150-5250 MHz 21.5 + / -1.5 dbm

WiFi

Bluetooth 2400-2483.5 MHz 8.5 + / -1.5 dbm

5250-5350 MHz

5470-5725 MHz

18.5 + / -1.5 dbm (no TPC)

21.5 + / -1.5 dbm (TPC)

25.5 + / -1.5 dbm (no TPC)

28.5 + / -1.5 dbm (TPC)

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

1.5 WiFi-802.11ac Module and ASRock WiFi 2.4/5 GHz Antennas 11

Chapter 2 Installation 13

2.1 Installing the CPU 14

2.2 Installing the CPU Fan and Heatsink 16

2.3 Installing Memory Modules (DIMM) 24

2.4 Expansion Slot (PCI Express Slot) 26

2.5 Jumpers Setup 27

2.6 Onboard Headers and Connectors 28

2.7 M.2_SSD (NGFF) Module Installation Guide (M2_1) 32

Chapter 3 Software and Utilities Operation 35

3.1 Installing Drivers 35

3.2 ASRock Motherboard Utility (A-Tuning) 36

3.2.1 Installing ASRock Motherboard Utility (A-Tuning) 36

3.2.2 Using ASRock Motherboard Utility (A-Tuning) 36

3.3 ASRock Live Update & APP Shop 39

3.3.1 UI Overview 39

3.3.2 Apps 40

3.3.3 BIOS & Drivers 43

3.3.4 Setting 44

3.4 ASRock Polychrome SYNC 45

Chapter 4 UEFI SETUP UTILITY 48

4.1 Introduction 48

4.1.1 UEFI Menu Bar 48

4.1.2 Navigation Keys 49

4.2 Main Screen 50

4.3 OC Tweaker Screen 51

4.4 Advanced Screen 55

4.4.1 CPU Conguration 56

4.4.2 Onboard Devices Conguration 57

4.4.3 Storage Conguration 59

4.4.4 ACPI Conguration 60

4.4.5 Trusted Computing 61

4.4.6 AMD PBS 62

4.4.7 AMD CBS 63

4.5 Tools 64

4.6 Hardware Health Event Monitoring Screen 65

4.7 Security Screen 67

4.8 Boot Screen 68

4.9 Exit Screen 71

Chapter 1 Introduction

ank you for purchasing ASRock B550M-ITX/ac 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 the BIOS soware might be updated, the
content of this documentation will be subject to change without notice. In case any
modications of this documentation occur, the upd ated version will be available on
ASRock’s website w ithout f urther notice. If you require technical support related to
this motherboard, please vi sit our website for s peci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.

B550M-ITX/ac

1.1 Package Contents

ASRock B550M-ITX/ac Motherboard (Mini-ITX Form Factor)

•

ASRock B550M-ITX/ac Quick Installation Guide

•

ASRock B550M-ITX/ac Support CD

•

1 x I/O Panel Shield

•

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

•

2 x ASRock WiFi 2.4/5 GHz Antennas (O pt iona l)

•

English

1

1.2 Specications

Platform

•

•

Mini-ITX Form Factor

Solid Capacitor design

CPU

Chipset

Memory

Supports 3

•

Processors (3000 and 4000 Series Processors)*

* Not compatible with AMD AthlonTM Processors.

Digi Power design

•

8 Power Phase design

•

AMD B550

•

Dual Channel DDR4 Memory Technology

•

2 x DDR4 DIMM Slots

•

AMD Ryzen series CPUs (Matisse) support DDR4 4600+

•

(OC)/4533(OC)/4466(OC)/4400(OC)/4333(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*

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)/380 0(OC)/3733(OC)/3600(OC)/346 6

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

un-buered memory*

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

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

* Please refer to page 23 for DDR4 UDIMM maximum

frequency support.

Max. capacity of system memory: 64GB

•

Supports Extreme Memory Prole (XMP) memory modules

•

15μ Gold Contact in DIMM Slots

•

rd

Gen AMD AM4 Ryzen™ / future AMD Ryzen™

English

2

B550M-ITX/ac

Expansion
Slot

Graphics

AMD Ryzen series CPUs (Matisse)

1 x PCI Express 4.0 x16 Slot (PCIE1: x16 mode)**

•

AMD Ryzen series APUs (Renoir)

1 x PCI Express 3.0 x16 Slot (PCIE1: x16 mode)**

•

* Supports PCIe riser cards to extend x8/x8 slots

** Supports NVMe SSD as boot disks

1 x Vertical M.2 Socket (Key E) with the bundled WiFi-

•

802.11ac module (on the rear I/O)

Integrated AMD RadeonTM Vega Series Graphics in Ryzen

•

Series APU*

* Actual support may vary by CPU

DirectX 12, Pixel Shader 5.0

•

Shared memory 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 Input 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®

•

Audio

7.1 CH HD Audio (Realtek ALC887 Audio Codec)

•

Supports Surge Protection

•

English

3

LAN

Wireless
LAN

Rear Panel
I/O

PCIE x1 Gigabit LAN 10/100/1000 Mb/s

•

Realtek RTL8111H

•

Supports Wake-On-LAN

•

Supports Lightning/ESD Protection

•

Supports Energy Ecient Ethernet 802.3az

•

Supports PXE

•

Intel® 802.11ac WiFi Module

•

Supports IEEE 802.11a/b/g/n/ac

•

Supports Dual-Band (2.4/5 GHz)

•

Supports high speed wireless connections up to 433Mbps

•

Supports Bluetooth 4.2+ High speed class II

•

2 x Antenna Ports

•

1 x PS/2 Mouse/Keyboard Port

•

1 x HDMI Port

•

1 x DisplayPort 1.4

•

2 x USB 2.0 Ports (Supports ESD Protection)

•

3 x USB 3.2 Gen1 Type-A Ports (Supports ESD Protection)

•

1 x USB 3.2 Gen1 Type-C Port (Supports ESD Protection)

•

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

•

LED)

HD Audio Jacks: Line in / Front Speaker / Microphone

•

English

4

Storage

Connector

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

•

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

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

•

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

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

Renoir)*

* Supports NVMe SSD as boot disks

* Supports ASRock U.2 Kit

1 x RGB LED Header

•

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

1 x Addressable LED Header

•

* Supports 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 ma ximum

1A (12W) fan power.

BIOS
Feature

B550M-ITX/ac

2 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.

* CHA_FAN1/WP and CHA_FAN2/WP can auto detect if 3-pin

or 4-pin fan is in use.

1 x 24 pin ATX Power Connector

•

1 x 8 pin 12V Power Connector

•

1 x Front Panel Audio Connector

•

1 x USB 2.0 Header (Supports 2 USB 2.0 ports) (Supports

•

ESD Protection)

1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports)

•

(Supports ESD Protection)

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, +1.8VSB, VDDP

•

Voltage Multi-adjustment

Temperature Sensing: CPU, Chassis/Water Pump Fans

Hardware
Monitor

OS

Certica­tions

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

•

Fan Tachometer: CPU, Chassis/Water Pump Fans

•

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

•

ture): CPU, Chassis/Water Pump Fans

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

•

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

•

Microso® Windows® 10 64-bit

•

FCC, CE

•

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

•

English

5

Please realiz e that the re is a certain r isk involved with o verclocking, including
adjusting the setting in the BIOS, applying Untied Overclocking Technology, or using
third-party overclocking tool s. Overclocking may aect your s ystem’s stability, or
even cause dam age to the components and devices of your system. It should be done
at your own risk and expense. We are not responsible for poss ible damage caused by
overclocking.

English

6

1.3 Motherboard Layout

10

11

13

5

3

2

1

4

DDR 4_B1 (6 4 bit, 28 8-pin m odule )

DDR 4_A1 (6 4 bit, 28 8-pin m odule )

ATXP WR1

PCIE1

HDLED RESE T

PLED PWRBT N

PANEL1

1

1

1

HD_AUDIO1

SATA3_1 _3

USB_3_ 4

1

CPU_FAN1

AMD

B550

SOCKETAM4

CLRCMOS1

RGB_LED1

1

1

ADDR_LED1

1

USB3_ 4_5

HDM I1

SATA3_2 _4

M2_ 1

DP1

CHA_FAN2/WP

CHA_FAN1
/WP

1

SPEAKER1

Top:

LINE I N

Cent er:

FRON T

Bott om:

MIC IN

M2_WIFI1

B550M-I TX/ ac

RoHS

USB 3.2 Gen1
T: USB3_3
B: USB3_TC_1

RJ- 45 LAN

USB 3.2 Gen1
T: USB1
B: USB2

USB 2. 0

T: USB1

B: USB 2

PS2

Keyb oard

/Mou se

ATX12V1

16

12

BAT1

B550M-ITX/ac

6

7

8

9

14

15

English

7

No. Description

1 CPU Fan Connector (CPU_FAN1)

2 Addressable LED Header (ADDR_LED1)

3 RGB LED Header (RGB_LED1)

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

5 2 x 288-pin DDR4 DIMM Slots (DDR4_ A1, DDR4_B1)

6 ATX Power Connector (ATXPWR1)

7 SATA3 Connectors (SATA3_1_3)

8 SATA3 Connec tors (SATA3_2_4)

9 USB 3.2 Gen1 Header (USB3_4_5)

10 System Panel Header (PANEL1)

11 USB 2.0 Header (USB_3_4)

12 Clear CMOS Jumper (CLRCMOS1)

13 Chassis/Water Pump Fan Connector (CHA _FAN2/WP)

14 Chassis Speaker Header (SPEAKER1)

15 Front Panel Audio Header (HD_AUDIO1)

16 ATX 12V Power Connector (ATX12V1)

English

8

1.4 I/O Panel

3

421

12 8

No. Description No. Description

1 USB 2.0 Ports (USB_12)* 7 USB 3.2 Gen1 Type-A Port (USB3_3)

2 LAN RJ-45 Port** 8 USB 3.2 Gen1 Type-C Port (USB3_TC_1)

3 Line In (Light Blue)*** 9 PS/2 Mouse/Keyboard Port

4 Front Speaker (Lime)*** 10 USB 3.2 Gen1 Type-A Port (USB3_1_2)

5 Antenna Ports 11 DisplayPort 1.4

6 Microphone (Pink)*** 12 HDMI Port

B550M-ITX/ac

56791011

* Please note that the USB_12 consume auxiliary power (+5VSB) while the other USB ports consume DUAL
Power (+5VDUAL). e USB_12 are optimal for connecting the USB Type speaker an d head set..

** 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 connection
On Link Green 1Gbps connection

English

9

*** Function of the Audio Ports in 7.1-channel Conguration:

Port Function

Light Blue (Rear panel) Rear Speaker Out
Lime (Rear panel) Front Speaker Out
Pink (Rear panel) Central /Subwoofer Speaker Out
Lime (Front panel) Side Speaker Out

English

10

B550M-ITX/ac

1.5 WiFi-802.11ac Module and ASRock WiFi 2.4/5 GHz Antennas

WiFi-802.11ac + BT Module

is motherboard comes with an exclusive WiFi 802.11 a/b/g/n/ac + BT v4.2 module

(pre-installed on the rear I/O panel) that oers support for WiFi 802.11 a/b/g/n/

ac connectivity standards and Bluetooth v4.2. WiFi + BT module is an easy-to-use

wireless local area network (WLAN) adapter to support WiFi + BT. Bluetooth v4.2

standard features Smart Ready technology that adds a whole new class of functionality

into the mobile devices. BT 4.2 also includes Low Energy Technology and ensures

extraordinary low power consumption for PCs.

* e transmission speed may vary according to the environment.

11

English

WiFi Antennas Installation Guide

Step 1

Prepare the WiFi 2.4/5 GHz Antennas that come

with the package.

Step 2

Connect the two WiFi 2.4/5 GHz Antennas to

the antenna connectors. Turn the antenna clock-

wise until it is securely connected.

Step 3

Set the WiFi 2.4/5 GHz Antenna as shown in the

illustration.

*You may need to adjust the direction of

the antenna for a stronger signal.

English

12

Chapter 2 Installation

is is a Mini-ITX 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.

B550M-ITX/ac

13

English

2.1 Installing the CPU

Unplug all power cables be fore installing the CPU.

1

English

14

2

B550M-ITX/ac

3

15

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. Ma ke sure that the

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

Please turn o th e power or remove the power cord before changing a CPU or heatsink.

Installing the CPU Box Cooler SR1

1

English

16

2

B550M-ITX/ac

3

4

1

N

FA

_

U

P

C

English

17

Installing the AM4 Box Cooler SR2

1

2

English

18

B550M-ITX/ac

3

19

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

20

Installing the AM4 Box Cooler SR3

1

B550M-ITX/ac

2

English

21

3

4

English

22

B550M-ITX/ac

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

23

2.3 Installing Memory Modules (DIMM)

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

and supports Dual Channel Memory Technology.

1. For dual channe l conguration, you always need to install identical (the same

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

2. It is unable to activate Dual Channel Memor y Technolog y with only one 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.

AMD non-XMP Memory Frequency Support

Ryzen Series CPUs (Matisse):

English

UDIMM Memory Slot

A1 B1

SR - 3200

- SR 3200

DR - 3200

- DR 3200

SR SR 3200

DR DR 3200

Ryzen Series APUs (Renoir):

UDIMM Memory Slot

A1 B1

SR - 3200

- SR 3200

DR - 3200

- DR 3200

SR SR 3200

DR DR 3200

Frequency

(Mhz)

Frequency

(Mhz)

24

e DIMM only ts in one correct orie ntation. It will cause permanent dam age to
the motherboard and the DIMM if you force the DIMM into the slot at incor rect
orientation.

1

2

B550M-ITX/ac

3

English

25

2.4 Expansion Slot (PCI Express Slot)

ere is 1 PCI Express slot 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. Plea se read the documentation of the
expan sion card and mak e necessary h ardware 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.

PCIe Slot Congurations

PCIE1

Ryzen Series CPUs (Matisse) Gen4x16

Ryzen Series APUs (Renoir) Gen3x16

For a better ther mal environme nt, ple ase connect a ch assis fan to the motherboard’s
chassis fan connector (CHA_ FA N1/WP or CHA_FAN2/WP) when using multiple
graphics cards.

English

26

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”.

B550M-ITX/ac

Clear CMOS Jumper

(CLRCMO S1)

(see p.7, No. 12)

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.

2-pin Jumper

Short: Clear CMOS

Open: Default

27

English

2.6 Onboard Headers and Connectors

PWRBTN

HDLED+

SPEAKER

Onboard headers and connectors are NOT jump ers. Do NOT place jumper caps over
these headers and connectors. Placing jumper caps over the headers and connectors
will cause permanent damage to the motherboard.

System Panel Header

(9-pi n PANEL1)

(see p.7, No. 10)

PWRBTN (Power Button):

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

RESET (Reset B utton):
Connec t to the reset button on the ch assi s front panel. P ress the reset button to
restar t the computer if the computer freezes an d fails to perform a nor mal restart.

PLED (Syste m Power LED):
Connec t to the power status indicator on the chas sis front panel. e LED i s on when
the system is ope rating. e LED keeps blinking when the system i s in S1/S3 sleep
state. e LED is o when the system is in S4 sleep 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 i s reading or writing data.

e front panel de sign may dier by chassis. A front panel module mainly consists
of power button , reset button, power LED, hard dr ive activity LED, speak er and etc.
When connect ing your chassis front panel module to this head er, make sure the wire
assig nments and the pin assig nments are matched correctly.

GND RESET#

#

PLED-

PLED+

1

GND

GND

HDLED-

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.

English

28

Chassis Speaker Header

(4-p i n SPEAKER1)

(see p.7, No. 14)

DUMMY

DUMMY

+5V

Please connect the chassis

speaker to this header.

1

B550M-ITX/ac

USB_PW

R

1

1

IntA_PB_SSTX+

IntA_PB_SSRX+

A_SSRX+

A_SSTX+

AGND_A

MIC2_DETECT

Serial ATA3 Connectors

(SATA3_1_3:

see p.7, No. 7)

(SATA3_2_4:

see p.7, No. 8)

USB 2.0 Headers

(9-pin USB_3_4)

(see p.7, No. 11)

USB 3.2 Gen1 Header

(19-pin USB3_4_ 5)

(see p.7, No. 9)

Front Panel Audio Header

(9-pin HD_ AUDIO1)

(see p.7, No. 15)

DUMMY

GNDGND

Dummy

IntA_PB_D+

IntA_PB_D-

IntA_PB_SSTX-

IntA_PB_SSRX-

OUT_DETECT

N/A

AGND_A

SATA3_3

SATA3_4

P+

P-

R

GND

GND

VbusV

SATA3_1

SATA3_2

P+

P-

USB_PW

IntA_PA_D+

IntA_PA_D-

GND

IntA_P

IntA_PA_SSTX-

GND

IntA_P

IntA_PA_SSRX-

VbusV

OUT L

OUT R

MIC2-R

MIC2-L

1

ese four SATA3

connectors support SATA

data cables for internal

storage devices with up to

6.0 Gb/s data transfer rate.

ere is one header on

this motherboard. is

USB 2.0 header can

support two ports.

ere is one header on

this motherboard. is

USB 3.2 Gen1 header can

support two ports.

is header is for

connecting audio devices

to the front audio panel.

1. High Denition Au dio supports Jack Sen sing, but the panel wire on the chas sis
must support HDA to function cor rectly. Please follow the instr uctions in our
manual and chassis manual to in stall your system.

2. If you use an AC’97 audio panel, please install it to the f ront panel audio heade r 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 ne ed to
connec t 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”.

English

29

Chassis Water Pump Fan

GND

1

GND

4 3 2 1

4 3 2 1

14

58

Connectors

(4-pin CHA_FAN1/WP)

(see p.7, No. 4)

(4-pin CHA_FAN2/WP)

(see p.7, No. 13)

CHA_FAN_SPEED

2
3
4

OL

FAN_VOLTAGE

FAN_VOLTAGE

CHA_FAN_SPEED

FAN_SPEED_CONTROL

is motherboard

provides two 4-Pin water

cooling chassis fan

connector. If you plan to

connect a 3-Pin

chassis

water cooler fan, please

connect it to Pin 1-3.

English

30

CPU Fan Connector

(4-pin CPU_FAN1)

(see p.7, No. 1)

ATX Power Connector

(24-p i n ATX PWR1)

(see p.7, No. 6)

ATX 12V Power

Connector

(8-pin ATX12V1)

(see p.7, No. 16)

GND

FAN_VOLTAGE

CPU_F

AN_SPEED

FAN_SPEED_CONTROL

12

24

1

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 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.

is motherboard

provides a 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.

B550M-ITX/ac

1

D

1

RGB LED Header

(4-p i n RGB_LED1)

(see p.7, No. 3)

Addressable LED Header

(3-pin A DDR_LE D1)

(see p.7, No. 2)

+12V GRB

DO_ADDR

VOUT

RGB header is used to connect

RGB LED extension cable which

allows users to choose from vari-

ous 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 45 for

further instructions on this

header.

is header is used to connect

GN

Addressable

LED extension cable

which allows users to choose

from various LED lighting

eects.

Caution: Never install the

Addressable LED cable in the

wrong orientation; otherwise,

the cable may be damaged.

* Please refer to page 46 for

further instructions on this

header.

English

31

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

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 Hyper M.2

Socket (M2_1) supports M Key type 2280 M.2 SATA3 6.0 Gb/s module and 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

32

No. 1

Nut Location A

PCB Length 8cm

Module Type Type 228 0

Step 3

1

B550M-ITX/ac

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

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

as this might damage the module.

NUT1NUT2

English

33

M.2_SSD (NGFF) Module Support List

Vendor Interface P/N

ADATA SATA3 AXNS330E-32GM-B
ADATA SATA3 AXNS381E-128GM-B
ADATA SATA3 AXNS381E -25 6GM-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-G25 6M6e
Plextor PCIe PX-G512M6e
Samsung PCIe x4 XP941-512G (MZHPU512HCGL)
SanDisk PCIe S D6PP4M-128G
SanDisk PCIe SD6PP4M-256G
Team SATA3 TM4PS4128GMC105
Team SATA3 TM4 PS 4256GMC105
Team SATA3 TM8PS4128GMC105
Team SATA3 TM8PS4256GMC105
Tra nscend SATA 3 TS256GMTS400
Tra nscend SATA 3 TS512GMTS600
Tra nscend SATA 3 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 SATA 3 WDS100T1B0B-00AS40
WD SATA 3 WDS240G1G0B-00RC30

English

34

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

details: http://www.asrock.com

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.

B550M-ITX/ac

35

English

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.

English

36

OC Tw eaker

Congurations for overclocking the system.

B550M-ITX/ac

System Info

View information about the system.

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

English

37

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 Utility (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.

English

38

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 f rom the ASRock Live Update & APP Shop.

3.3.1 UI Overview

Category Panel

Hot News

B550M-ITX/ac

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 allows 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 know more.

English

39

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.

English

40

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.

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.

B550M-ITX/ac

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

English

41

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.

English

42

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.

B550M-ITX/ac

Step 1

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

Step 2

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

Step 3

Click Update to start the update process.

English

43

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.

English

44

B550M-ITX/ac

1

3.4 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 strip to the

RGB LED Header (RGB_LED1)

B550 M-I TX/ ac

on the motherboard.

RGB_LED1

+12V GRB

1

B

R

G

V

2

1

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

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

1. Plea se note that the RGB LED strip do not come w ith the package.

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

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

English

45

Connecting the Addressable RGB LED Strip

D

1

Connect your

the motherboard.

Addressable RGB LED

strip to the

Addressable LED Header (ADDR_ LED1)

ADDR_LED1

B55 0M-I TX/ ac

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

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

VOUT

DO_ADDR

on

GN

1

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

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

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

English

46

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.

B550M-ITX/ac

47

English

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, other wise, 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 upd ated, the following UEFI setup
screens and de scriptions are for refe rence purpose only, and they may not exactly
match what you see on your scre en.

4.1.1 UEFI Menu Bar

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

English

48

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

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

B550M-ITX/ac

+ / -

<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

49

English

4.2 Main Screen

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

display the system overview.

English

50

4.3 OC Tweaker Screen

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

B550M-ITX/ac

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

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.

CCD0

CCX0 Frequency (MHz)

Use this item to adjust CCX0 Frequency.

CCX1 Frequency (MHz)

Use this item to adjust CCX1 Frequency.

English

51

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.

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

English

52

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.

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.

2.50V Voltage

Congure the voltage for the 2.50V Voltage.

B550M-ITX/ac

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 refulator.

CPU Load-Line Calibration

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

heavy loading.

VDDCR_SOC Voltage

Congure the voltage for the VID-requested VDDCR_SOC supply level.

VDDCR_SOC Load-Line Calibration

CPU VDDCR_SOC Load-Line Calibration helps prevent VDDCR_SOC voltage droop when

the system is under heavy loading.U

VPPM

Congure the voltage for the VPPM.

VDDP

Congure the voltage for the VDDP.

+1.8 Voltage

Congure the voltage for the +1.8V.

DRAM Voltage

Congure the voltage for the DRAM.

Chipset 1.05V Voltage

Congure the voltage for the chipset 1.05V voltage.

Save User Default

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

English

53

Load User Default

Load previously saved user defaults.

Save User UEFI Setup Prole to Disk

Save current UEFI settings as an user default prole to disk.

Load User UEFI Setup Prole to Disk

Load previously saved user defaults from the disk.

English

54

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 PBS and AMD CBS.

B550M-ITX/ac

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.

English

55

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.

English

56

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.

4.4.2 Onboard Devices Conguration

Turn On Onboard LED in S5

Turn on/o the 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.

B550M-ITX/ac

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.

English

57

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.

English

58

4.4.3 Storage Conguration

SATA M o de

AHCI: Supports new features that improve performance.

B550M-ITX/ac

RAID: Combine multiple disk drives into a logical unit.

SATA Hot Plug

Enable/disable the SATA Hot Plug function.

English

59

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. We

recommend disabling Deep Sleep for better system compatibility and stability.

English

60

PS/2 Keyboard S4/S5 Wakeup Support

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

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.

4.4.5 Trusted Computing

Security Device Support

Enable or disable BIOS support for security device.

B550M-ITX/ac

61

English

4.4.6 AMD PBS

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

English

62

4.4.7 AMD CBS

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

B550M-ITX/ac

63

English

4.5 Tools

Easy RAID Installer

Easy R AID Installer helps you to copy the R AID 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

All the SSD's listed that supports Secure Erase function.

English

64

NVME Sanitization Tool

Aer you Sanitize SSD, all user data will be permanently 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.

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.

B550M-ITX/ac

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.

CPU FAN1 Temp Source

Select a fan temperature source for CPU Fan 1.

FAN Conguration

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.

English

65

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.

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 n g

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

English

66

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.

B550M-ITX/ac

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.

English

67

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.

English

68

Fast Boot

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

from an USB storage device.

CSM (Compatibility Support Module)

CSM

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

you’re running a WHCK test.

B550M-ITX/ac

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.

English

69

AddOn ROM Display

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

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

English

70

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.

B550M-ITX/ac

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.

English

71

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 http://www.asrock.com/support/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-ITX/ac

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

(EU conformity marking)

For the following equipment:

Motherboard

(Product Name)

B550M-ITX/ac / 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 ڛ
ڛ EN 61000-3-2:2014

ڛ RED

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

—

Directive 2014/53/EU

EN 300 328 V2.1.1 EN 301 489-17 V3.1.1

☐
☐

EN 301 893 V2.1.1 ☐ EN 301 489-3 V2.1.1

☐ EN 300 220 V3.1.1

☐

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

☐

EN 60950-1 : 2011+ A2: 2013 ☐ EN 60950-1 : 2006/A12: 2011

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)

June 26, 2020

(Date)

P/N: 15G062238000AK V1.0

ڛ

EN 61000-3-3:2013

ڛ