ASUS Prime B450M-A II Service Manual
PRIME B450M-A II
Motherboard
E17196
First Edition
August 2020
Copyright © 2020 ASUSTeK COMPUTER INC. All Rights Reserved.
No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
permission of ASUSTeK COMPUTER INC. (“ASUS”).
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the
product is defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS
DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,
LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),
EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Products and corporate names appearing in this manual may or may not be registered trademarks or
copyrights of their respective companies, and are used only for identication or explanation and to the
owners’ benet, without intent to infringe.
ii
Contents
Safety information ...................................................................................................... iv
About this guide .......................................................................................................... v
Package contents ....................................................................................................... vi
PRIME B450M-A II specifications summary ............................................................. vi
Connectors with shared bandwidth .......................................................................... x
Chapter 1 Product Introduction
1.1 Before you proceed ...................................................................................... 1-1
1.2 Motherboard overview ................................................................................. 1-1
1.3 Central Processing Unit (CPU) .................................................................... 1-8
1.4 System memory ............................................................................................ 1-9
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 qualied 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 qualied service
technician or your retailer.
• Your motherboard should only be used in environments with ambient temperatures
between 0°C and 40°C.
iv
About this guide
This user guide contains the information you need when installing and conguring 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.
v
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 B450M-A II 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 B450M-A II specifications summary
AMD Socket AM4 for 3rd/2nd/1st Gen AMD Ryzen™ / 2nd and 1st Gen AMD
CPU
Chipset AMD B450 Chipset
Memory
Graphics
Expansion Slots
Ryzen™ with Radeon™ Vega Graphics / Athlon™ with Radeon™ Vega
Graphics Processors*
*Refer to www.asus.com for CPU support list.
4 x DIMM, Max. 128GB, 4400(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/
3600(O.C.)/3466(O.C.)/3400(O.C.)/3300(O.C.)/3200(O.C.)/3000(O.C.)/
2800(O.C.)/2666/2400/2133 MHz, Un-buffered Memory*
Dual Channel Memory Architecture
* ECC memory (ECC mode) support varies by CPU.
*The maximum memory frequency supported varies by processor.
*Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
Integrated Graphics in the 2nd and 1st Gen AMD Ryzen™ with
Radeon™ Vega Graphics / Athlon™ with Radeon™ Vega Graphics
Processors
1 x D-Sub
1 x DVI-D
1 x HDMITM 2.0b
*Graphics specifications may vary between CPU types.
3rd/2nd/1st Gen AMD Ryzen™ Processors
1 x PCIe 3.0 x16 slot (supports x16 mode)
2nd and 1st Gen AMD Ryzen™ with Radeon™ Vega Graphics
Processors
1 x PCIe 3.0 x16 slot (supports x8 mode)
Athlon™ with Radeon™ Vega Graphics Processors
1 x PCIe 3.0 x16 slot (supports x4 mode)
AMD B450 Chipset
2 x PCIe 2.0 x1 slots
(continued on the next page)
vi
PRIME B450M-A II specifications summary
Total supports 1 x M.2 slot and 6 x SATA 6Gb/s ports*
3rd/2nd/1st Gen AMD Ryzen™ / 2nd and 1st Gen AMD Ryzen™ with
Radeon™ Vega Graphics Processors
M.2 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 &
SATA modes)
Athlon™ with Radeon™ Vega Graphics Processors
Storage
Ethernet
USB
Audio
Back Panel I/O Ports
M.2 slot (Key M), type 2242/2260/2280/22110 (supports SATA mode)
3rd/2nd/1st Gen AMD Ryzen™ / 2nd and 1st Gen AMD Ryzen™ with
Radeon™ Vega Graphics / Athlon™ with Radeon™ Vega Graphics
Processors
2 x SATA 6Gb/s ports with RAID 0, 1, 10 support
AMD B450 Chipset
4 x SATA 6Gb/s ports with RAID 0, 1, 10 support
* The M.2 slot shares bandwidth with the SATA6G_5/6 ports, and therefore the
SATA6G_5/6 ports cannot be used when an M.2 device is installed.
1 x Realtek RTL8111H 1Gb Ethernet
Rear USB (Total 6 ports)
2 x USB 3.2 Gen 2 ports (2 x Type-A)
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 7.1 Surround Sound High Denition Audio CODEC*
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192kHz 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
Surround Sound 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 BIOS FlashBack™ button
1 x PS/2 Keyboard/Mouse combo port
(continued on the next page)
vii
PRIME B450M-A II specifications summary
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
1 x M.2 slot (Key M)
6 x SATA 6Gb/s ports
Internal I/O
Connectors
Special Features
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 AURA RGB header
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 (14-1 pin)
1 x 10-1 pin System Panel header
ASUS 5X PROTECTION III
- ASUS DIGI+ VRM
- ASUS LANGuard
- ASUS Overvoltage Protection
- ASUS SafeSlot Core
- ASUS Stainless-Steel Back I/O
ASUS Q-Design
- ASUS Q-DIMM
- ASUS Q-Slot
ASUS Thermal Solution
- Aluminum heatsink design
ASUS EZ DIY
- BIOS FlashBack™ button
- BIOS FlashBack™ LED
AURA Sync
- AURA RGB header
ASUS Lighting Control
(continued on the next page)
viii
PRIME B450M-A II specifications summary
ASUS Exclusive Software
Armoury Crate
- AURA Creator
- AURA Sync
AI Suite 3
- Performance and Power Saving Utility
TurboV EVO
EPU
DIGI+ VRM
Fan Xpert 2+
PC Cleaner
Software Features
BIOS
Manageability
Operating System
Form Factor
- EZ update
- System Information
ASUS CPU-Z
AI Charger
ASUS EZ Installer
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
Windows 7 64- bit*
* To support Windows 7 64- bit, please install an AMD Ryzen™ 2nd Generation or
Ryzen™ 1st Generation Processor.
mATX Form Factor
9.6 inch x 9.5 inch (24.4 cm x 24 cm)
Specications are subject to change without notice. Refer to the ASUS website for the
latest specications.
ix
Connectors with shared bandwidth
FLBK_LED1
BIOS_FLBK
DVI
HDMI
KBMS
_U32G1_78
U32G2_56
LAN_U32G1_34
AUDIO
Super
I/O
Realtek
Codec
8111H
VGA
RTL
EATX12V
SPDIF_OUT
AAFP
CHA_FAN1
PCIEX1_1
PCIEX1_2
BATTERY
256Mb
BIOS
TPM
228022110 2260 2242
PCIEX16
COM
COM_DEBUG
USB34 USB56
DIGI+
VRM
U32G1_12
CHA_FAN2
CPU_FAN
SOCKET AM4
M.2(SOCKET3)
SPEAKER
F_PANEL
A
RGB_HEADER
DDR4 DIMM_A1 (64bit, 288-pin module)
DDR4 DIMM_A2* (64bit, 288-pin module)
DDR4 DIMM_B1 (64bit, 288-pin module)
DDR4 DIMM_B2* (64bit, 288-pin module)
AMD
B450
CLRTC
SATA6G_1
SATA6G_2 SATA6G_3
SATA6G_4
EATXPWR
SATA6G_5 SATA6G_6
A
A
x
Configuration
M.2 PCIe 3.0 x4 / SATA mode -
A
SATA6G_5/6 - v
1 2
The M.2 slot shares bandwidth with the SATA6G_5/6 ports, and therefore the SATA6G_5/6
ports cannot be used when an M.2 device is installed.
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