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Asus PRIME B840M-A WIFI (Socket AM5) DDR5 Micro-ATX Motherboard

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Socket AM5, B840 Chipset, Supports 7000/8000/9000 series AMD Ryzen, 4x DIMM Slots, DDR5 7600MHz (OC), PCIe Gen 4, 4x SATA 6Gb/s connectors, 3x M.2 Slot, 2.5GB LAN, mATX
£187.00 (incl. VAT)
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SKU MOT-ASU-03849
EAN 4711387797143
MPN 90MB1J20-M0EAY0
MANUFACTURER Asus
Motherboard Specifications
Category Details
CPU AMD Socket AM5 for AMD Ryzen™ 9000, 8000, & 7000 Series Desktop Processors*
* Refer to ASUS Support for CPU support list.
Chipset AMD B840 Chipset
Memory 4 x DIMM slots, max. 192GB, DDR5
Supports up to 7600+MT/s (OC) with Ryzen™ 9000, 8000, & 7000 Series Processors, ECC and Non-ECC, Un-buffered DIMM*
Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO™)
ASUS Enhanced Memory Profile (AEMP)
* Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration. Refer to the ASUS website for details.
Graphics 2 x DisplayPort**
1 x HDMI™ port***
** Supports max. 8K@30Hz as specified in DisplayPort 1.4.
*** Supports 4K@60Hz as specified in HDMI 2.1.
Expansion Slots AMD Ryzen™ 9000 & 7000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x16 mode)
AMD Ryzen™ 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
AMD B840 Chipset
2 x PCIe 3.0 x16 slots (support x1 mode)
* Please check the PCIe bifurcation table on the ASUS support site.
Storage Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports*
AMD Ryzen™ 9000, 8000, & 7000 Series Desktop Processors
- M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
- M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
AMD B840 Chipset
- M.2_3 slot (Key M), type 2280 (supports PCIe 3.0 x4 mode)
- 4 x SATA 6Gb/s ports
* AMD RAIDXpert2 Technology supports both PCIe RAID 0/1/5/10 and SATA RAID 0/1/5/10. RAID 5 Function is only supported by AMD Ryzen™ 9000 series CPU.
Ethernet 1 x Realtek 2.5Gb Ethernet
ASUS LANGuard
Wireless & Bluetooth® Wi-Fi 6E (2x2)
Supports 2.4/5/6GHz frequency band*
Bluetooth® v5.3**
* WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later.
** The Bluetooth® version may vary, please refer to the Wi-Fi module manufacturer's website for the latest specifications.
USB Rear USB (Total 7 ports)
- 2 x USB 10Gbps ports (2 x Type-A)
- 1 x USB 5Gbps port (1 x USB Type-C®)
- 4 x USB 2.0 ports (4 x Type-A)
Front USB (Total 7 ports)
- 1 x USB 5Gbps connector (supports USB Type-C®)
- 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
- 2 x USB 2.0 headers support 4 additional USB 2.0 ports
Audio 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 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.
Back Panel I/O Ports - 2 x USB 10Gbps ports (2 x Type-A)
- 1 x USB 5Gbps port (1 x USB Type-C®)
- 4 x USB 2.0 ports (4 x Type-A)
- 2 x DisplayPort
- 1 x HDMI™ port
- 1 x Wi-Fi module
- 1 x Realtek 2.5Gb Ethernet port
- 3 x Audio jacks
- 1 x BIOS FlashBack™ button
Internal I/O Connectors Fan and Cooling Related
- 1 x 4-pin CPU Fan header
- 1 x 4-pin CPU OPT Fan header
- 1 x 4-pin AIO Pump header
- 3 x 4-pin Chassis Fan headers
Power Related
- 1 x 24-pin Main Power connector
- 1 x 8-pin +12V CPU Power connector
Storage Related
- 3 x M.2 slots (Key M)
- 4 x SATA 6Gb/s ports
USB
- 1 x USB 5Gbps connector (supports USB Type-C®)
- 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
- 2 x USB 2.0 headers support 4 additional USB 2.0 ports
Miscellaneous
- 3 x Addressable Gen 2 headers
- 1 x Clear CMOS header
- 1 x COM Port header
- 1 x Front Panel Audio header (F_AUDIO)
- 1 x S/PDIF Out header
- 1 x SPI TPM header (14-1 pin)
- 1 x 10-1 pin Front System Panel header
Special Features ASUS 5X PROTECTION III
- DIGI+ VRM
- LANGuard
- Overvoltage protection
- SafeSlot Core+
- Stainless-steel back I/O
ASUS Q-Design
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED Core
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink
- VRM heatsink design
ASUS EZ DIY
- BIOS FlashBack™ button
- BIOS FlashBack™ LED
- Pre-mounted I/O shield
Aura Sync
- Addressable Gen 2 headers
Software Features ASUS Exclusive Software
- Armoury Crate
-- Aura Creator
-- Aura Sync
-- Fan Xpert 2+
-- Power Saving
- ASUS DriverHub
- ASUS GlideX
- TurboV Core
- ASUS CPU-Z
- Norton 360 Deluxe (60 Days Free Trial)
- WinRAR (40 Days Free Trial)
UEFI BIOS
- ASUS EZ DIY
-- ASUS CrashFree BIOS 3
-- ASUS EZ Flash 3
-- ASUS UEFI BIOS EZ Mode
-- ASUS MyHotkey
BIOS 256 Mb Flash ROM, UEFI AMI BIOS
Manageability WOL by PME, PXE
Accessories Cables
- 2 x SATA 6Gb/s cables
Miscellaneous
- 1 x ASUS WiFi Q-Antenna
- 1 x M.2 rubber package
- 3 x Screw packages for M.2 SSD
Documentation
- 1 x Quick start guide
Operating System Windows 11, Windows 10 64-bit
Form Factor micro-ATX Form Factor
9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)
Back Connect
Back Connect No
Lighting
Lighting Yes
Colour
Primary Colour Black
Form Factor
Motherboard formfactor Micro-ATX
CPU
CPU Manufacturer AMD
CPU Socket AM5
Motherboard
Motherboard Chipset AMD B840
Built-In I/O Shield Yes
Dimensions
Length / Depth 244 mm
Width 244 mm
Wi-Fi & LAN
LAN Yes
LAN Ports 1x 2.5 Gbit/s
Wi-Fi / Bluetooth Yes
Wi-Fi Standard Wi-Fi 6E
Bluetooth Standard 5.3
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
Fan Header
4 Pin Fan Connectors 6
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
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)
Storage Ports
M.2 PCIe 3.0 x4 1
M.2 PCIe 4.0 x4 2
SATA 6G (internal) 4
Expansion Slots
PCIe 4.0 x16 mechanical slot 1
PCIe 3.0 x1 mechanical slot 2
Cooling
Backplate Yes
M.2 Heatsinks Yes
VRM Heatsinks Yes
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£187.00 (incl. VAT)
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