ASUS Prime B550M-K Service Manual

PRIME B550M-K

Motherboard

E16604 First Edition

April 2020

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Contents

Safety information ...................................................................................................... iv

About this guide .......................................................................................................... v

Package contents ....................................................................................................... vi

PRIME B550M-K specifications summary................................................................ vi

Chapter 1 Product introduction

1.1 Before you proceed ...................................................................................... 1-1

1.2 Motherboard overview ................................................................................. 1-1

1.3 Central Processing Unit (CPU) .................................................................... 1-7

1.4 System memory ............................................................................................ 1-8

Chapter 2 BIOS and RAID Support

2.1 Knowing BIOS ...............................................................................................2-1

2.2 BIOS setup program .....................................................................................2-2

2.3 ASUS EZ Flash 3 ...........................................................................................2-3

2.4 ASUS CrashFree BIOS 3 .............................................................................. 2-4

2.5 RAID configurations ..................................................................................... 2-5

Appendix

Notices ..................................................................................................................... A-1

ASUS contact information ...................................................................................... A-6

iii

Safety information

Electrical safety

• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet before relocating the system.

• When adding or removing devices to or from the system, ensure that the power cables for the devices are unplugged before the signal cables are connected. If possible, disconnect all power cables from the existing system before you add a device.

• Before connecting or removing signal cables from the motherboard, ensure that all power cables are unplugged.

• Seek professional assistance before using an adapter or extension cord. These devices could interrupt the grounding circuit.

• Ensure that your power supply is set to the correct voltage in your area. If you are not sure about the voltage of the electrical outlet you are using, contact your local power company.

• If the power supply is broken, do not try to x it by yourself. Contact a qualied service technician or your retailer.

Operation safety

• Before installing the motherboard and adding components, carefully read all the manuals that came with the package.

• Before using the product, ensure all cables are correctly connected and the power cables are not damaged. If you detect any damage, contact your dealer immediately.

• To avoid short circuits, keep paper clips, screws, and staples away from connectors, slots, sockets and circuitry.

• Avoid dust, humidity, and temperature extremes. Do not place the product in any area where it may be exposed to moisture.

• Place the product on a stable surface.

• If you encounter technical problems with the product, contact a qualied service technician or your retailer.

• Your motherboard should only be used in environments with ambient temperatures between 0°C and 40°C.

About this guide

This user guide contains the information you need when installing and conguring the

motherboard.

How this guide is organized

This guide contains the following parts:

• Chapter 1: Product introduction

This chapter describes the features of the motherboard and the new technology it supports. It includes descriptions of the switches, jumpers, and connectors on the motherboard.

• Chapter 2: BIOS and RAID Support

This chapter tells how to boot into the BIOS, upgrade BIOS using the EZ Flash Utility and support on RAID.

Where to find more information

Refer to the following sources for additional information and for product and software updates.

1. ASUS website

The ASUS website provides updated information on ASUS hardware and software products. Refer to the ASUS contact information.

2. Optional documentation

Your product package may include optional documentation, such as warranty flyers, that may have been added by your dealer. These documents are not part of the standard package.

Conventions used in this guide

To ensure that you perform certain tasks properly, take note of the following symbols used throughout this manual.

CAUTION: Information to prevent damage to the components and injuries to yourself when trying to complete a task.

IMPORTANT: Instructions that you MUST follow to complete a task.

NOTE: Tips and additional information to help you complete a task.

Package contents

Check your motherboard package for the following items.

Motherboard

Cables

Miscellaneous

Application DVD

Documentation

If any of the above items is damaged or missing, contact your retailer.

1 x PRIME B550M-K motherboard

2 x SATA 6Gb/s cables

1 x I/O Shield 1 x M.2 SSD screw package

1 x Support DVD

1 x User manual

PRIME B550M-K specifications summary

CPU

Chipset AMD B550 Chipset

Memory

Graphics

Expansion Slots

Storage

Ethernet

AMD Socket AM4 for 3rd Gen AMD Ryzen™ Processors*

*Refer to www.asus.com for CPU support list.

3rd Gen AMD Ryzen™ Processors

4 x DIMM, Max. 128GB, DDR4 4400(O.C.)/4000(O.C.)/3866(O.C.)/3600

(O.C.)/3466(O.C.)/3200/3000/2800/2666/2400/2133 MHz, Un-buffered Memory*

Dual Channel Memory Architecture

*ECC Memory (ECC mode) support varies by CPU. *Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).

1 x D-Sub

1 x DVI-D

1 x HDMI

2.1(4K@60HZ)

3rd Gen AMD Ryzen™ Processors

1 x PCIe 4.0 x16 slot (supports x16 mode)

AMD B550 Chipset

2 x PCIe 3.0 x1 slots

Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports 3rd Gen AMD Ryzen™ Processors

M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 &

SATA modes)

AMD B550 Chipset

M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA

modes)

4 x SATA 6Gb/s ports

Support Raid 0, 1, 10

1 x Realtek RTL8111H 1Gb Ethernet

(continued on the next page)

PRIME B550M-K specifications summary

Rear USB (Total 6 ports)

2 x USB 3.2 Gen 2 ports (2 x Type-A)

USB

Audio

Back Panel I/O Ports

Internal I/O Connectors

4 x USB 3.2 Gen 1 ports (4 x Type-A)

Front USB (Total 6 ports)

1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports

2 x USB 2.0 headers support additional 4 USB 2.0 ports

Realtek ALC887 7.1-Channel High Definition Audio CODEC*

- Supports Jack detection, Multi-streaming, Front Panel Jack-retasking

- Supports up to 24-Bit/192 kHz playback

Audio Features

- Audio Shielding

- LED-illuminated audio trace path design

- Premium Japanese audio capacitors

- Dedicated audio PCB layers

* A chassis with an HD audio module in the front panel is required to support

7.1-channel audio output.

2 x USB 3.2 Gen 2 ports (2 x Type-A)

4 x USB 3.2 Gen 1 ports (4 x Type-A)

1 x D-Sub port

1 x DVI-D port

1 x HDMITM port

1 x Realtek RTL8111H 1Gb Ethernet port

3 x Audio jacks

1 x PS/2 Keyboard/Mouse combo port

Fan and cooling related

1 x 4-pin CPU Fan header

2 x 4-pin Chassis Fan headers

Power related

1 x 24-pin Main Power connector

1 x 8-pin +12V Power connector

Storage related

2 x M.2 slots (Key M)

4 x SATA 6Gb/s ports

USB

1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports

2 x USB 2.0 headers support additional 4 USB 2.0 ports

Miscellaneous

1 x Clear CMOS header

1 x COM Port header

1 x Front Panel Audio header (AAFP)

1 x S/PDIF Out header

1 x Speaker header

1 x SPI TPM header (14-1pin)

1 x 10-1 pin System Panel header

(continued on the next page)

vii

PRIME B550M-K specifications summary

ASUS 5X PROTECTION III

- ASUS DIGI+ VRM

- ASUS LANGuard

- ASUS Overvoltage Protection

- ASUS SafeSlot Core

Special Features

Software Features

BIOS

Manageability

Operating System

Form Factor

- ASUS Stainless-Steel Back I/O

ASUS Q-Design

- ASUS Q-DIMM

- ASUS Q-Slot

ASUS Thermal Solution

- Aluminum heatsink design

ASUS Lighting Control

ASUS Exclusive Software

Armoury Crate

AI Suite 3

- Performance And Power Saving Utility

TurboV EVO EPU

Digi+ VRM Fan Xpert 2+

- EZ update

ASUS CPU-Z

AI Charger

DAEMON Tools

Norton Anti-virus software (Free Trial for 60 days)

WinRAR

UEFI BIOS

ASUS EZ DIY

- ASUS CrashFree BIOS 3

- ASUS EZ Flash 3

- ASUS UEFI BIOS EZ Mode

256 Mb Flash ROM, UEFI AMI BIOS

WOL by PME, PXE

Windows® 10 - 64 bit

mATX Form Factor

9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm )

viii

Specications are subject to change without notice. Refer to the ASUS website for the

latest specications.

Product introduction

1.1 Before you proceed

Take note of the following precautions before you install motherboard components or change any motherboard settings.

• Unplug the power cord from the wall socket before touching any component.

• Before handling components, use a grounded wrist strap or touch a safely grounded object or a metal object, such as the power supply case, to avoid damaging them due to static electricity.

• Before you install or remove any component, ensure that the ATX power supply is switched off or the power cord is detached from the power supply. Failure to do so may cause severe damage to the motherboard, peripherals, or components.

1.2 Motherboard overview

Place this

side towards

the rear of the

chassis

5 115 24 4

KBMS _U32G1 _78

EATX12V

DVI

VGA

HDMI

U32G2_56

AUDIO

BATTERY

CHA_FAN1

22110

RTL

8111H

Super

I/O

PCIEX1_1

PCIEX1_2

ALC 887

SPDIF_OUT

COM

AAFP

LAN_U32G1_34

TPM

256Mb BIOS

2280 2260 2242

PCIEX16

2280

2260 2242

COM_DEBUG

CHA_FAN2

24.4cm(9.6in)

4111213

DIGI+ VRM

USB34USB12

M.2_1(SOCKET3)

M.2_2(SOCKET3)

SPEAKER

F_PANEL

CPU_FAN

SOCKET AM4

DDR4 DIMM_A1 (64bit, 288-pin module)

DDR4 DIMM_A2* (64bit, 288-pin module)

AMD B550

SATA6G_4

SATA6G_3 SATA6G_2 SATA6G_1

EATXPWR

DDR4 DIMM_B1 (64bit, 288-pin module)

DDR4 DIMM_B2* (64bit, 288-pin module)

U32G1_12

CLRTC

716149

Unplug the power cord before installing or removing the motherboard. Failure to do so can cause you physical injury and damage motherboard components.

24.4cm(9.6in)

ASUS PRIME B550M-K

1-1

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