Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard

Future-Proof Connectivity

With a range of USB ports, including USB Type-C, this B840M AM5 Micro ATX Motherboard offers versatile connectivity options for all your peripherals and devices. Fast Ethernet ensures reliable network performance for online gaming and seamless streaming, while high-definition audio delivers immersive sound quality for an enhanced entertainment experience.

FEATURES:

• Intel B840M Chipset
• Supports AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors
• Supports DDR5 Memory, Dual Channel DDR5 7600+ MT/s (OC) 256GB max capacity
• Ultra-fast Realtek 2.5G Ethernet LAN
• Lightning Fast Game experience: PCIe 4.0 slot support
• Asus Fan Xpert 2+ for more cooling control
• EZ PC DIY: SafeSlot Core+ and Q-LED Core, BIOS Flashback, and a pre-mounted I/O shield for easy usage
• Aura Sync support for full RGB lighting control

SPECIFICATIONS:

• CPU:
  • AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors*
  • * 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 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
  • * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
• Graphics:
  • 2 x DisplayPort**
  • 1 x HDMI™ port***
  • * Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
  • ** 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 support site (https://www.asus.com/support/FAQ/1037507/).
  • ** 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.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
  • * Specifications vary by CPU types.
• RAID:
  • 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
• 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
  • * USB Type-C® power delivery output: max. 5V/3A
• 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 Realtek 2.5Gb Ethernet port
  • 3 x Audio jacks
  • 1 x BIOS FlashBack™ button
• Operating System: Windows 11, Windows 10 64-bit
• Form Factor: Micro ATX

WHAT’S IN THE BOX:

• Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard – Black x1
• SATA Cables x2
• M.2 rubber package x1
• Screw Package for M.2 SSD x2
• Quick Start Guide x1

Why Asus?

ASUS is a globally recognised tech company renowned for quality and innovation. For over three decades, ASUS has consistently delivered cutting-edge PC components and electronics, earning the trust of gamers, professionals, and everyday users alike. Choose ASUS for reliability, performance, and a commitment to pushing the boundaries of what's possible. When building your next PC, an ASUS AM5 motherboard is a solid foundation.