MotherboardsAsus
Asus PRIME B840M-A WIFI (Socket AM5) DDR5 Micro-ATX Motherboard
MPN: 90MB1J20-M0EAY0
Key specifications
SocketAM5
Form factormATX
ChipsetAMD B840
Memory typeDDR5
M.2 slots2
Max Memory192 GB
Retailer offers
Amazon UKProduct link
Find on AmazonMore retailers coming
We only list a retailer once we hold verified offer data for it. No placeholder prices, ever.
Indexed prices are snapshots, not live quotes. Confirm price, stock and delivery on the retailer's site — checkout completes there.
We may earn a commission from these links. How it works
Fit check
Add this to your build in the PC Builder to automatically check dimensions, sockets, and power draw.
Same specs for less
- ASRock B650M-HDV/M.2 MicroATX Motherboard£98.47at Scan£18.00 less
Same socket and DDR5 memory · 3 M.2 slots
- ASRock AMD B650 PG Lightning ATX Motherboard£108.98at eBay UK£7.49 less
Same socket and DDR5 memory · 4 M.2 slots
Matched on the listed specs that matter for this kind of part, at each listing's lowest new price. Other details (cooling, warranty, looks) can differ.
Full Specifications77 fields
Additional Information
Model Number
90MB1J20-M0EAY0
Gtin
4711387797143
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 WIFI
Form Factor
MicroATX
Chipset
AMD B840
CPU
Cpu Manufacturer
AMD
Socket
AM5
Dimensions
Length Depth
244 mm
Width
244 mm
Expansion Slots
Pcie 4 0 X16 Mechanical Slot
1
Pcie 3 0 X1 Mechanical Slot
2
External Connectivity
Network Interface Type
802.11ax Wi-Fi 6E LAN
Wired 2.5 Gigabit LAN
Network Chip Modules
1 x 802.11ax WiFi 6E + BT5.3
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 3.2 Gen1 Type-C
2 x USB 3.2 Gen2 Type-A
1 x WiFi Module
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 Gen4x4
2 x PCIe 3.0 x16
1 x PCIe 4.0 x16
Sata Support
SATA3
Raid Support Via
-
Storage Mode Support
RAID 0
RAID 1
RAID 10
RAID 5
Internal I O
1 x 24-pin (Power)
1 x 4-pin AIO Pump Connector
3 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 S/PDIF-Out Header
4 x SATA III - 6Gb/s
1 x Serial (COM) Header
1 x TPM (SPI_TPM) header
2 x USB 2.0 Header
1 x USB 3.2 Gen1 Header
1 x USB 3.2 Gen1 Type-C Front Panel 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
Yes
Fi Lan Wi Fi Standard
Wi-Fi 6E
Fi Lan Bluetooth Standard
5.3
General
Audio
7.1 Channel HD Audio