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Main image of ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 2 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 3 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 4 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 5 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 6 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 7 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 8 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 9 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 10 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 11 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 12 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 13 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 14 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 15 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 16 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 17 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 18 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 19 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Alt view image 20 of 20 - ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

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ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

Item #: 9SIV0F2KJB5449
Mfr. Part #: 90MB1J20-MVAAYC
UNSPSC: 43201513

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ASUS Corporate Stable Model (CSM) is a commercial program designed to provide stable and reliable motherboards.
Ready for Advanced AI PC: Designed for the future of AI computing, with the power and connectivity needed for demanding AI applications
AMD AM5 Socket: Ready for AMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processors
Enhanced Power Solution: 6-layer PCB, alloy chokes and durable capacitors for stable power delivery
Ultrafast Connectivity: Wi-Fi 6E, PCIe 4.0 x16 slot, PCIe 4.0 M.2 slots, Realtek 2.5Gb Ethernet, rear USB 10Gbps Type-A ports, rear and front USB 5Gbps Type-C support
Comprehensive Cooling: VRM and M.2 heatsinks, PCH heatsink, hybrid fan headers and Fan Xpert 2+
DIY Friendly Design: Pre-mounted I/O shield, BIOS FlashBack, M.2 heatsink, Q-Antenna, Q-Dashboard, Q-LED Core
Unmatched Personalization: Three Addressable Gen 2 headers, all configurable with ASUS-exclusive Aura Sync RGB lighting

Overview

Specs

Reviews

Asus Prime B840M-A WIFI-CSM Gaming Desktop Motherboard - AMD B840 Chipset - Socket AM5 - Micro ATX - Ryzen 7, Ryzen 8, Ryzen 9 Processor Supported - 192 GB DDR5 SDRAM Maximum RAM - DIMM, UDIMM - 4 x Memory Slots - Gigabit Ethernet - 2.5G igabit Ethernet - IEEE 802.11 ax - HDMI - DisplayPort - 4 x SATA Interfaces

Model
Brand	ASUS
Model	PRIME B840M-A WIFI-CSM
Part Number	90MB1J20-MVAAYC

Supported CPU
CPU Socket Type	AM5
CPU Type	Ryzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series

Chipsets
Chipset	AMD B840

Memory
Number of Memory Slots	4x288pin (DDR5)
Memory Standard	Up to 7600+MT/s (OC)
Maximum Memory Supported	192GB
Channel Supported	Dual Channel
Memory Performance Profile	AMD EXPO
ECC Supported	Yes
Buffer Supported	Un-buffered
Memory Feature	Dual channel memory architecture Supports AMD Extended Profiles for Overclocking (EXPO) ASUS Enhanced Memory Profile (AEMP)

Expansion Slots
PCI Express 4.0 x16	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)
PCI Express 3.0 x16	AMD B840 Chipset 2 x PCIe 3.0 x16 slots (support x1 mode)

Storage Devices
Serial ATA (SATA)	4 x SATA 6Gb/s
M.2	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)
SATA RAID	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.

Onboard Audio
Audio Channels	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.

Onboard LAN
Max LAN Speed	2.5Gbps
Wireless LAN	Wi-Fi 802.11 ax
Bluetooth	Bluetooth 5.3

Rear Panel Ports
Back 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
Onboard 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
Other 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 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

Physical Spec
Form Factor	Micro ATX
Dimensions (W x L)	9.6" x 9.6"
Power Pin	1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector

Software Feature
BIOS Feature	256 Mb Flash ROM, UEFI AMI BIOS
Software	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
Windows 11	Windows 11, Windows 10 64-bit

Features
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

Packaging
Package Contents	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

Additional Information
First Listed on Newegg	July 14, 2025

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ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

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Item#: 9SIV0F2KJB5449

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ASUS PRIME B840M-A WIFI-CSM AMD AM5 B840 mATX motherboard, Advanced AI Ready, DDR5, PCIe 4.0 Ready, three M.2 slots, Wi-Fi 6E, 2.5Gb LAN, DisplayPort, HDMI, USB 5Gbps Type-C, BIOS FlashBack, Aura

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