Press / to jump to the search bar
Images are for reference purposes only and product appearances/colours may vary.

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. Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B840M-A WIFI maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits. PRIME B840M-A WIFI offers a total of three M.2 slots, including two that support data-transfer speeds of up to 64 Gbps via PCIe 4.0, and one that supports PCIe 3.0. This enables quicker boot-up and app load times with OS or application drives. The Q-LED Core display produces color-coded lights during the Power-On Self-Test (POST) that can help you troubleshoot potential issues.

CPU

AMD Socket AM5

  • Supports AMD Ryzen 7000 / 8000 / 9000 Series Desktop Processors
ChipsetAMD B850
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 DIMM
  • Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
  • Dual Channel Memory Architecture 
  • Supports AMD EXTended Profiles for Overclocking (EXPO)
  • ASUS Enhanced Memory Profile (AEMP)
Onboard Graphics

Integrated Graphics Processor:

  • 1 x HDMI port
    • Supports max. 4K@60Hz as specified in HDMI 2.1.
  • 2 x DisplayPort
    • Supports max. 8K@30Hz as specified in DisplayPort 1.4
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
    • A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
  • Audio Features
    • Audio Shielding
    • Premium audio capacitors
    • Dedicated audio PCB layers
LAN

1 x Realtek 2.5Gb Ethernet

  • ASUS LANGuard
Wireless Communication Module

Wi-Fi 6E

  • 2x2 Wi-Fi 6E (802.11ax)
  • Supports 2.4/5/6GHz frequency band

Bluetooth v5.3

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)
Storage Interface

Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports

AMD Ryzen 9000 & 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 Ryzen  8000 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/x2 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

  • Ryzen 9000 Series Processors: RAID 0/1/5/10
  • Ryzen 8000 Series Processors: RAID 0/1
  • Ryzen 7000 Series Processors: RAID 0/1/10
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)
    • USB Type-C power delivery output: max. 5V/3A
  • 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
  • 2 x USB 2.0 headers support 4 additional USB 2.0 ports
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
Back Panel Connectors
  • 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
I/O Controller
  • Not Specified
H/W Monitoring
  • Voltage detection
  • Temperature detection
  • Fan speed detection
  • Fan fail warning
  • Fan speed control
BIOS

256 Mb Flash ROM

  • UEFI AMI BIOS
Unique Features

ASUS TUF PROTECTION

  • DIGI+ VRM (- Digital power design with DrMOS)
  • ESD Guards
  • TUF LANGuard
  • Overvoltage protection
  • SafeSlot
  • Stainless-steel back I/O

ASUS Q-Design

  • M.2 Q-Latch
  • PCIe Slot Q-Release
  • Q-Antenna
  • Q-Dashboard
  • Q-DIMM
  • Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green])

ASUS Thermal Solution

  • M.2 heatsink
  • VRM heatsink design

ASUS EZ DIY

  • BIOS FlashBack button
  • BIOS FlashBack LED
  • ProCool
  • Pre-mounted I/O shield
  • SafeDIMM

Aura Sync

  • Addressable Gen 2 headers
Bundled 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
Operating System
  • Support for Windows 11 64-bit
Form Factor

Micro ATX Form Factor

  • 24.4cm x 24.4cm

Manufacturer
Manufacturer's WebsiteLink *
Product WebsiteLink *
Warranty Information
Warranty Duration3 Years
* These links will redirect to an external website which may be governed by its own privacy policy. We do not share customer information with external sites outside of what's lined out in our Privacy Policy.

Write a review

Note: HTML is not translated!
    Bad           Good

ASUS PRIME B840M-A WIFI, AMD B840 Chipset, Socket AM5, Micro ATX Desktop Motherboard

- Socket Socket AM5, AMD B840 Chipset
- Supports Ryzen 7000 / 8000 / 9000 Series Processors
- 4 x DDR5 DIMM Slots, up to 256GB, DDR5-7600+
- 1 x PCIe 4.0 x16 Slot
- 2 x PCIe 3.0 x16 (x1 Electrical) Slots
- 2 x M.2 PCIe 4.0 NVMe Slots
- 1 x M.2 PCIe 3.0 NVMe Slot

- 4 x SATA 3.0 Ports, Supports RAID 0 / 1 / 5 / 10
- 2.5Gbps LAN, Wi-Fi 6E & Bluetooth 5.3
- 1 x HDMI 2.1, 2 x DisplayPort 1.4

- 1 x Rear USB Type-C 5Gb/s
- 3 x Rear USB Type-A 10Gb/s
-
4 x USB 2.0/1.1 Ports
- 3 x Rear Audio Jacks
- BIOS Flashback: Update BIOS without CPU / RAM / GPU
- ASUS Q-LED Core for Boot Diagnostics
-
Q-Antenna Quick-Release Wi-Fi Antenna
- 3 x ARGB Gen2 Headers
- Form Factor: Micro ATX
- 3 Year Warranty

  • Product Code: 90MB1J20-M0EAY0
  • Availability: In Stock with Supplier leadtimeTooltip Lead Times:
    • In Stock with Progenix: Ready for collection/dispatch once payment clears. The cut-off for same-day dispatch is 12:00pm on business days.
    • In Stock with Supplier: 1-3 business days until dispatched or ready for collection
    • Out Of Stock: Contact us to see if this item will be restocked.
  • R4,699
  • R3,549



Price displayed is already subject to a 4% discount for EFT payments