Asus Prime B450M-A AMD AM4 Micro ATX with Aura Sync RGB DDR4 Motherboard | 90MB0YR0-M0EAY0

In stock
  • Micro-ATX Form Factor
  • AMD B450 Chipset
  • Socket AM4
  • 4 x Dual-Channel DDR4-3200 (OC)
  • 6 x SATA III, 1 x M.2
  • 1 x PCIe 3.0 x16 Slot
  • 2 x PCIe 2.0 x1 Slots
  • Realtek ALC 887-VD2 8-Channel HD Audio
  • Realtek 8111H Gigabit LAN
  • Asus Aura RGB Lighting

Asus Prime B450M-A AMD AM4 Micro ATX Motherboard


The Prime B450M-A/CSM AM4 Micro-ATX Motherboard from Asus is built on the AMD B450 chipset supporting first- and second-generation socket AM4 AMD Ryzen processors. It has four memory slots, which can accommodate up to 64GB of DDR4 RAM at speeds of up to 3200 MHz when overclocked. For storage, there are six SATA III ports and one M.2 slot that supports both SATA and PCIe 3.0 x4 interface for speeds of up to 32 Gb/s when used with an appropriate M.2 drive. While it's equipped with VGA, DVI-D, and HDMI ports for integrated graphics, this motherboard also has one PCIe 3.0 x16 slot for a dedicated GPU as well as two PCIe 2.0 x1 slots for other PCIe-based hardware. Other noteworthy integrated features include Realtek ALC 887-VD2 8-channel HD audio, Realtek 8111H Gigabit LAN, and Asus Aura RGB lighting.


To help keep things cool, the B450M has multiple fan headers that support both DC and PWM modes, so you can control their speed within BIOS or a third-party software to find a perfect balance between noise and cooling.
Aside from six SATA ports, this motherboard is also equipped with a single M.2 slot, which supports both PCIe and SATA interfaces, for speeds of up to 32 Gb/s when used with an appropriate drive. Moreover, all AMD B450 motherboards come with AMD StoreMI technology, which is a software designed to increase system responsiveness by caching frequently used data to your SSD or RAM.
There are four memory slots supporting up to 64GB of DDR4 RAM at speeds of up to 3200 MHz when overclocked. It also supports ECC memory; however, compatibility varies by CPU.
The Prime B450M is built with Realtek ALC 887-VD2 8-channel HD audio, LED illumination, audio shielding, dedicated PCB layers, and premium audio capacitors to deliver an immersive listening experience for all types of applications whether you're using speakers or headphones.
Aside from the built-in LED-illuminated audio section of this motherboard, it also has an Asus Aura Sync RGB header that you can use for other RGB-compatible products to light up your build.
For Ryzen processors with integrated Radeon Vega graphics, this motherboard has HDMI, DVI-D, and VGA ports you can use to connect a display. Both DVI-D and VGA supports up to a max resolution of 1920 x 1200 at 60 Hz, whereas the HDMI interface can reach up to 4096 x 2160 at 60 Hz.
Additional Features
  • Q-DIMM & Q-Slot enhanced RAM circuitry
  • Asus 5x Protection III: SafeSlot Core, ESD Guard, Over-voltage Protection, Stainless-Steel Back I/O, and Digi+ VRM

Supported CPU

CPU Socket Type
CPU Type
AM4 socket for AMD Ryzen 2nd Generation/ Ryzen with Radeon Vega Graphics/ Ryzen 1st Generation Processors
* Refer to for the AMD CPU support list.


AMD B450


Number of Memory Slots
Memory Standard
DDR4 3200(O.C)/ 3000(O.C)/ 2800(O.C)/ 2666/ 2400/ 2133
* Refer to for the Memory QVL (Qualified Vendors List).
Maximum Memory Supported
Channel Supported
Dual Channel

Expansion Slots

PCI Express 3.0 x16
AMD Ryzen 2nd Generation/ Ryzen 1st Generation Processors
1 x PCIe 3.0/2.0 x16 (x16 mode)

AMD Ryzen with Radeon Vega Graphics Processor
1 x PCIe 3.0/2.0 x16 (x8 mode)
PCI Express x1
2 x PCI Express 2.0 x1 slots

Storage Devices

SATA 6Gb/s
6 x SATA 6Gb/s
1 x M.2 socket 3 with M Key, Type 2242/2260/2280/22110 (PCIE 3.0 x4 and SATA modes) storage devices support*
* The M.2 Socket shares bandwidth with the SATA_5/6 ports, and therefore the SATA_5/6 ports cannot be used when an M.2 device is installed.

Onboard Video

Onboard Video Chipset
Integrated Graphics in the AMD Ryzen with Radeon Vega Graphics Processors
Multi-VGA output support: HDMI, DVI-D, D-Sub ports
- Supports HDMI 2.0b with a maximum resolution of 4096 x 2160 @60Hz
- Supports DVI-D with max. resolution up to 1920 x 1200 @60Hz
- Supports D-Sub with max. resolution up to 1920 x 1200 @60Hz

Onboard Audio

Audio Chipset
Realtek ALC887
Audio Channels
8 Channels
* Use a chassis with HD audio module in the front panel to support an 8-channel audio output.

Onboard LAN

LAN Chipset
Realtek RTL8111H
Max LAN Speed

Rear Panel Ports

1 x PS/2 keyboard (purple)
1 x PS/2 mouse port (green)
Video Ports
1 x DVI-D port 
1 x D-Sub port
1 x HDMI
1 x RJ45
USB 3.1
2 x USB 3.1 Gen 2 ports
4 x USB 3.1 Gen 1 ports
Audio Ports
3 Ports

Internal I/O Connectors

Onboard USB
1 x USB 3.1 Gen 1 (up to 5Gbps) connector(s) support(s) additional 2 USB 3.1 Gen 1 port(s) (19-pin)
2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)
Other Connectors
1 x Aura RGB Strip Header
1 x TPM header
1 x COM port(s) connector(s)
1 x CPU Fan connector(s) (1 x 4-pin)
2 x Chassis Fan connector(s) (2 x 4-pin)
1 x S/PDIF out header(s)
1 x Front panel audio connector(s) (AAFP)
1 x System panel(s)
1 x Clear CMOS jumper(s)
1 x Speaker connector

Physical Spec

Form Factor
Micro ATX
LED Lighting
Dimensions (W x L)
243.84 mm x 241.30 mm
Power Pin
1 x 24-pin EATX Power connector
1 x 8-pin ATX 12V Power connector


Special Features:
ASUS 5X Protection III:
- ASUS SafeSlot Core: Fortified PCIe Slot prevents damage
- ASUS LANGuard: Protects against LAN surges, lightning strikes and static-electricity discharges!
- ASUS Overvoltage Protection: World-class circuit-protecting power design
- ASUS Stainless-Steel Back I/O: 3X corrosion-resistance for greater durability!
- ASUS DIGI+ VRM: 6 Phase digital power design
ASUS Exclusive Features:
- AI Suite 3
- Ai Charger
ASUS Quiet Thermal Solution:
- Stylish Fanless Design Heat-sink solution
- ASUS Fan Xpert 2+
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- Multi-language BIOS
ASUS Q-Design:
- ASUS Q-Slot

128MB Flash ROM, UEFI AMI BIOS, PnP, SM BIOS 3.1, ACPI 6.1, Multi-language BIOS, ASUS EZ Flash 3, ASUS CrashFree BIOS 3, F3 My Favorite, Last Modified log, F12 PrintScreen, ASUS DRAM SPD (Serial Presence Detect) memory information, F6 Qfan Control

Operating System:
Windows 10 64-bit


Package Contents
User's manual
I/O Shield
2 x SATA 6Gb/s cable(s)
1 x M.2 Screw Package
1 x Supporting DVD
Chipset BrandAMD B450
SocketAMD AM4
Form FactorATX

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