ASUS PRIME B840M-A WIFI-CSM AM5 M-ATX Motherboard

The ASUS PRIME B840M-A WIFI-CSM is a micro ATX motherboard that partners the AMD B840 chipset with an AM5 socket. It welcomes Ryzen 7000, 8000, and 9000 series processors, so builders can start with the latest CPUs and still have room to upgrade in the future. Its smaller form factor slips into compact cases without giving up the expansion options that gamers, content creators, and office professionals expect.

Four DDR5 DIMM slots allow up to 192 GB of memory at speeds that reach 7600 MT/s, giving demanding applications the bandwidth they need. Storage flexibility is extensive: three M.2 sockets accommodate two PCIe 4.0 NVMe drives and one PCIe 3.0 device for rapid boot times and project files, while four SATA III ports handle high-capacity hard drives or SSDs used for backups and media libraries.

For add-in cards, the board offers two PCIe 4.0 x16 slots that suit graphics cards, capture cards, or compute accelerators. Two additional PCIe 3.0 x16 slots operate in x1 mode for peripherals such as sound or network cards. Systems built around an APU can drive displays through the onboard HDMI 2.1 or DisplayPort 1.4 connectors, making a discrete GPU optional for office or entertainment setups.

Networking and external connectivity are ready for modern workloads. A Wi-Fi 6E radio pairs with Bluetooth 5.3 for wireless devices, while a Realtek 2.5 Gb Ethernet port handles low-latency wired connections. Multiple rear USB ports include 10 Gb/s Type-A for fast external SSDs and a 5 Gb/s Type-C connector for newer peripherals and quick chargers.

Additional touches round out the package. The onboard BIOS FlashBack button simplifies firmware updates, even without a CPU installed, and the Realtek 7.1-channel audio codec supplies 24-bit, 192 kHz playback for clear voice chat, movies, and music. Whether you are assembling a space-saving gaming rig, a creative workstation, or a reliable home office PC, this motherboard provides a balanced platform that keeps pace with current and upcoming hardware.

Highlights:

• AM5 socket with Ryzen 7000, 8000, and 9000 CPU support
• 3x M.2 slots including two PCIe 4.0 and one PCIe 3.0
• 4x DDR5 DIMM slots supporting up to 192GB at 7600 MT/s
• Wi-Fi 6E tri-band and Bluetooth 5.3 connectivity
• Dual PCIe 4.0 x16 and dual PCIe 3.0 x16 (x1) expansion slots
• Rear I/O with USB 10 Gb/s Type-A and USB 5 Gb/s Type-C
• Realtek 2.5 Gb Ethernet port
• Integrated HDMI 2.1 and DisplayPort 1.4 outputs
• BIOS FlashBack support with onboard button
• Realtek 7.1-channel audio codec with 24-bit / 192 kHz playback