Description

The ASUS PRIME B840M-A WIFI CSM motherboard is built for business and mainstream performance with support for Intel® Core™ 14th, 13th, and 12th Gen processors using the LGA1700 socket. It supports DDR5 memory up to 192GB and features PCIe® 5.0 for next-gen graphics, M.2 PCIe 4.0 storage, and robust power delivery with 10+1 DrMOS stages. Designed under ASUS’s Corporate Stable Model (CSM) program, it includes long-term support, IT management tools, and enhanced protection. The board also provides fast networking with Wi-Fi 6 and Realtek 2.5Gb Ethernet, USB 3.2 Gen 2×2 Type-C®, and comprehensive connectivity for versatile business or productivity-focused desktop builds.

Key Features

CPU Support: Intel® 14th, 13th & 12th Gen Core™, Pentium® Gold, and Celeron® processors (LGA1700 socket)
Memory: 4x DDR5 DIMM slots, up to 192GB, 6800+ MT/s (OC)
Power Design: 10+1 DrMOS power stages with Digi+ VRM and ProCool connector

Expansion Slots:
 • 1x PCIe® 5.0 x16 SafeSlot
 • 1x PCIe® 4.0 x16 (x4 mode)
 • 1x PCIe® 3.0 x1 slot

Storage Options:
 • 2x M.2 slots (1x PCIe® 4.0 x4, 1x PCIe® 4.0 x4 & SATA)
 • 4x SATA 6Gb/s ports

Networking:
 • Realtek 2.5Gb Ethernet
 • Wi-Fi 6 (802.11ax)
 • Bluetooth® v5.2

USB Ports:
 • Rear: 1x USB 3.2 Gen 2×2 Type-C®, 2x USB 3.2 Gen 2 Type-A, 2x USB 3.2 Gen 1, 2x USB 2.0
 • Front: 1x USB 3.2 Gen 1 Type-C®, headers for USB 3.2 Gen 1 and USB 2.0

Display Outputs:
 • 1x HDMI™ port (4K@60Hz)
 • 1x DisplayPort
 • 1x D-Sub

Audio: Realtek 7.1 Surround Sound High Definition Audio CODEC
Business Features: ASUS Corporate Stable Model (CSM), IT management tools, 5X Protection III
Form Factor: micro-ATX (24.4 cm x 24.4 cm)

Key Specifications

Chipset: Intel® B840
CPU Socket: LGA1700
Memory Support: DDR5 4800–6800+ MT/s (OC), Dual Channel, Non-ECC, Unbuffered
Max Memory: 192GB

Expansion Slots:
 • 1x PCIe® 5.0 x16
 • 1x PCIe® 4.0 x16 (x4 mode)
 • 1x PCIe® 3.0 x1

Storage:
 • 1x M.2 (PCIe® 4.0 x4)
 • 1x M.2 (PCIe® 4.0 x4 & SATA)
 • 4x SATA 6Gb/s

USB Ports:
 • Rear: 1x USB 3.2 Gen 2×2 Type-C®, 2x USB 3.2 Gen 2 Type-A, 2x USB 3.2 Gen 1, 2x USB 2.0
 • Front: 1x USB 3.2 Gen 1 Type-C®, USB 3.2 Gen 1 and USB 2.0 headers

Display Outputs:
 • 1x HDMI™ port (4K@60Hz)
 • 1x DisplayPort
 • 1x D-Sub

Audio Codec: Realtek 7.1 Surround Sound High Definition Audio CODEC
LAN: Realtek 2.5Gb Ethernet
Wireless: Wi-Fi 6, Bluetooth® v5.2
Form Factor: micro-ATX (24.4 cm x 24.4 cm)