Model
Brand
ASUS
Model
PRIME B650M-A II-CSM
Part Number
90MB1EH0-M0AAYC
Supported CPU
CPU Socket Type 
AM5
CPU Type
Supports AMD Ryzen 7000 Series Desktop Processors*

* Refer to www.asus.com for CPU support list.
Chipsets
Chipset 
AMD B650
Memory
Number of Memory Slots
4x288pin (DDR5)
Memory Standard
DDR5 6400+(OC)/6200(OC)/6000(OC)/5800(OC)/5600(OC)/5400(OC)/5200/5000/4800 ECC and Non-ECC, Un-buffered Memory*
Maximum Memory Supported
128GB
Channel Supported 
Dual Channel
ECC Supported
Yes
Buffer Supported
Un-buffered
Memory Feature
Dual Channel Memory Architecture
Supports AMD Extended Profiles for Overclocking (EXPO™)
OptiMem II
* Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support under the Support tab or visit https://www.asus.com/support/

* Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Expansion Slots
PCI Express 4.0 x16
AMD Ryzen 7000 Series Desktop Processors*
1 x PCIe 4.0 x16 slot (supports x16 mode)

AMD B650 Chipset
2 x PCIe 4.0 x16 slots (support x1 mode)
Storage Devices
SATA 6Gb/s 
4 x SATA 6Gb/s
M.2
AMD Ryzen 7000 Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)

AMD B650 Chipset
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
SATA RAID
AMD RAIDXpert2 Technology supports both PCIe RAID 0/1/10 and SATA RAID 0/1/10.
Onboard Audio
Audio Chipset 
Realtek 7.1 Surround Sound 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
- 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.
Audio Channels 
7.1 Channels
Onboard LAN
Max LAN Speed
1 x Realtek 2.5Gb Ethernet
Rear Panel Ports
Back I/O Ports
2 x USB 3.2 Gen 2 ports (2 x Type-A)
2 x USB 3.2 Gen 1 ports (2 x Type-A)
4 x USB 2.0 ports (4 x Type-A)
1 x DisplayPort
1 x VGA port
1 x HDMI® port
1 x Realtek 2.5Gb Ethernet port
3 x Audio jacks
1 x BIOS FlashBack™ button
1 x PS/2 Keyboard/Mouse combo port
Internal I/O Connectors
Onboard USB
1 x USB 3.2 Gen 1 connector (supports USB Type-C )
1 x USB 3.2 Gen 1 header supports 2 additional USB 3.2 Gen 1 ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Other Connectors
Fan and Cooling related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
3 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

Miscellaneous
3 x Addressable Gen 2 headers
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 (14-1pin)
1 x 10-1 pin System Panel header
Physical Spec
Form Factor
Micro ATX
Dimensions (W x L)
9.6" x 9.6"
Power Pin
1 x 24-pin Main Power connector
1 x 8-pin +12V Power connector
Windows 11 Compatibility
Windows 11
Supported
Features
Features
ASUS 5X PROTECTION III
- DIGI+ VRM
- LANGuard
- Overvoltage Protection
- SafeSlot Core+
- Stainless-Steel Back I/O
ASUS Q-Design
- Q-DIMM
- Q-LED core
- Q-Slot
ASUS Thermal Solution
- VRM heatsink design
ASUS EZ DIY
- BIOS FlashBack™ button
- BIOS FlashBack™ LED
Aura Sync
- Aura RGB header
- Addressable Gen 2 headers
Packaging
Package Contents
Cables
2 x SATA 6Gb/s cables

Miscellaneous
1 x I/O Shield
1 x Screw packages for M.2 SSD

Documentation
1 x User guide
Additional Information
Date First Available
January 17, 2023