Asus Prime B840m-a Wifi Motherboard

ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen 9000 series processors. The PRIME B840M-A WIFI motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It's designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.

Tech Spec

Model
PRIME B840M-A WIFI
News & Updates

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CPU
AMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processorsx
x Refer to https://www.asus.com/support/download-center/ for CPU support list.

Chipset
AMD B840 Chipset

Memory
4 x DIMM slots, max. 256GB, DDR5
Supports up to 7600+MT/s (OC) with Ryzen 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC, Un-buffered DIMMx
Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO )
ASUS Enhanced Memory Profile (AEMP)
x 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 list under the Support tab of product information site or visit https://www.asus.com/support/download-center/. Adjustments will be made based on the specifications of mass-produced memory products available on the market.
x Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.

Graphics
2 x DisplayPortxx
1 x HDMI portxxx
x Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
xx Supports max. 8K@30Hz as specified in DisplayPort 1.4.
xxx Supports 4K@60Hz as specified in HDMI 2.1.
Expansion Slots
AMD Ryzen 9000 & 7000 Series Desktop Processorsx
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)xx
AMD B840 Chipset
2 x PCIe 3.0 x16 slots (support x1 mode)
x Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/).
xx Specifications vary by CPU types.
- To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.

Storage
Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports
AMD Ryzen 9000 & 7000 Series Desktop Processors
M.21 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
M.22 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
AMD Ryzen 8000 Series Desktop Processors
M.21 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
M.22 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)x
AMD B840 Chipset
M.2_3 slot (Key M), type 2280 (supports PCIe 3.0 x4 mode)
4 x SATA 6Gb/s ports
x Specifications vary by CPU types.
AMD RAIDXpert2 Technology
Ryzen 9000 Series Processors: RAID 0/1/5/10
Ryzen 8000 Series Processors: RAID 0/1
Ryzen 7000 Series Processors: RAID 0/1/10

Ethernet
1 x Realtek 2.5Gb Ethernet
ASUS LANGuard
Wireless & Bluetooth
Wi-Fi 6E
2x2 Wi-Fi 6E (802.11ax)
Supports 2.4/5/6GHz frequency bandx
Bluetooth v5.3xx
x WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later.
xx 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
x USB Type-C power delivery output: max. 5V/3A

Audio
Realtek 7.1 Surround Sound High Definition Audio CODECx
- 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
x 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 Panel System 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
Adobe Creative Cloud (Free Trial)
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
2 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)

What's in the box
Cables
2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS WiFi Q-Antenna
1 x M.2 rubber package
2 x Screw packages for M.2 SSD
Documentation
1 x Quick start guide