MotherboardsAsus
Asus PRIME B840M-A-CSM (Socket AM5) DDR5 Micro-ATX Motherboard
MPN: 90MB1J10-M0EAYC
Key specifications
SocketAM5
Form factormATX
ChipsetAMD B840
Memory typeDDR5
M.2 slots3
Max Memory192 GB
Full Specifications77 fields
Additional Information
Model Number
90MB1J10-M0EAYC
Gtin
4711387797204
Additional Specifications
Water Cooled
No
Cooling
Passive Heatsinks
Qpi Speed
N/A
Dimensions
244x244x50mm ( L x W x H) mm
Note
-
Back Connect
Back Connect
No
Colour
Primary Colour
Black
Cooling
Backplate
Yes
M 2 Heatsinks
Yes
Vrm Heatsinks
Yes
Core Specifications
Edition
PRIME B840M-A
Form Factor
MicroATX
Chipset
AMD B840
CPU
Cpu Manufacturer
AMD
Socket
AM5
Dimensions
Length Depth
244 mm
Width
244 mm
Expansion Slots
Pcie X16 Slots Total
1
Pcie X1 Slots Total
2
Pcie 4 0 X16 Mechanical Slot
1
Pcie 3 0 X16 Mechanical Slot
2
External Connectivity
Network Interface Type
Wired 2.5 Gigabit LAN
Network Chip Modules
1 x Realtek (2.5GbE LAN)
Rear I O Connectors
1 x 10/100/1000/2500 (LAN)
1 x BIOS Flashback Button
2 x DisplayPort
1 x HDMI
1 x Line In
1 x Line Out
1 x Mic-In
4 x USB 2.0
1 x USB 3.1 Gen1 Type-C
2 x USB 3.2
External Ports
Usb 3 1 External Type A
2
Usb 3 0 External Type C
1
Usb 2 0 External Type A
4
Display Connectors
HDMI (1x), Display Port (2x)
Fan Header
4 Pin Fan Connectors
6
Form Factor
Motherboard Formfactor
Micro-ATX
Graphics Support
Primary Gpu Interface
PCIe 4.0 (x16)
Nvidia Sli Support
N/A
Amd Crossfire Support
N/A
Integrated Graphics
-
On Board Graphics Connectors
None
Internal Connectivity
Expansion Slots
1 x M.2, 22-42/60/80, PCIe Gen4x4
1 x M.2, 22-80, PCIe Gen3
1 x M.2, 22-80, PCIe Gen4x4
2 x PCIe 3.0 x16
1 x PCIe 4.0 x16
Sata Support
N/A
Raid Support Via
-
Storage Mode Support
RAID 0
RAID 1
RAID 10
RAID 5
Internal I O
1 x 24-pin (Power)
2 x 4-pin CHA_FAN connector
1 x 4-pin CPU Fan Connector
1 x 4-pin CPU OPT Fan Connector
1 x 8-pin (Power)
3 x Addressable Gen 2 Header
1 x Clear CMOS Header
1 x Front Panel Audio Header
1 x Front Panel Connector
1 x S/PDIF-Out Header
4 x SATA III - 6Gb/s
1 x Serial (COM) Header
1 x TPM (SPI_TPM) header
Internal Ports
Cpu Power Supply
1x 8-Pin
Usb 3 0 3 1 3 2 Internal Type C Header
1
Usb 3 0 3 1 3 2 Internal Type C Possible Ports
1
Usb 3 0 Internal Header
1
Usb 3 0 Internal Possible Ports
2
Usb 2 0 Internal Header
2
Usb 2 0 Internal Possible Ports
4
Rgb Led Connectors
3x Digital RGB (3-Pin 5VDG)
Front Panel Audio Header
Yes
Spi Tpm Header
Yes
Lighting
Lighting Rgb
Yes
Memory
Max Memory
192 GB
Memory Type
DDR5
Memory Form Factor
DIMM
Max Memory Speed Oc
7600 MT/s
Eec Support
Yes
Memory Slots
4x
Performance Profile
AMD EXPO
Motherboard
Motherboard Chipset
AMD B840
Built In I O Shield
Yes
RAM Memory Support
Memory Channel
-
Memory Type Ecc
ECC/Non-ECC
Memory Type R U
UDIMM (Unbuffered)
Memory Speed Mhz
DDR5 - 7600(OC)
Max Memory Capacity
192GB (4x48GB)
Storage Ports
M 2 Pcie 3 0 X4
1
M 2 Pcie 4 0 X4
2
Sata 6g Internal
4
Wi
Fi Lan Lan
Yes
Fi Lan Lan Ports
1x 2.5 Gbit/s
Fi Lan Wi Fi Bluetooth
No
General
Audio
7.1 Channel HD Audio
Best indexed price
£120.98GBP
Indexed 25 May 2026 — verify at retailer
