The ASUS Prime B840M-A CSM motherboard is an AM5 socket micro ATX board built on the AMD B840 chipset, designed to support AMD Ryzen 9000, 8000, and 7000 series desktop processors.
Key features include:
Memory: 4 DDR5 DIMM slots supporting up to 256GB RAM with speeds up to 7600+ MT/s (overclocked), with support for AMD EXPO and ASUS Enhanced Memory Profiles (AEMP). It supports ECC and non-ECC unbuffered DDR5 memory.
Expansion: Three PCIe x16 slots for GPUs and other cards, with PCIe 4.0 support.
Storage: Three M.2 slots (Key M) with PCIe 4.0 support and four SATA 6Gb/s ports.
Networking: Realtek 2.5Gb Ethernet with ASUS LANGuard for reliable wired connectivity.
USB: Multiple USB ports including two 10Gbps Type-A, one 5Gbps Type-C, and several USB 2.0 ports distributed across front and rear panels.
Video Outputs: Two DisplayPort and one HDMI port supporting integrated GPU output.
Audio: Realtek 7.1 Surround Sound HD Audio codec with high-quality capacitors and audio shielding.
Cooling: Multiple fan headers including CPU and chassis fans, along with VRM and M.2 heatsinks.
Features: ASUS 5X PROTECTION III (DIGI+ VRM, Overvoltage Protection, SafeSlot Core+, stainless-steel back I/O), BIOS FlashBack, Aura Sync RGB lighting support, and robust build quality.
Form Factor: Micro ATX (244 mm x 244 mm)
Additional: BIOS FlashBack button, TPM header, COM port header, and front panel system connectors.
Warranty: Typically covered with ASUS 3-year warranty support.
This motherboard is suitable for professional and enterprise applications requiring high reliability and support for the latest AMD Ryzen processors with DDR5 memory in a compact micro ATX form factor.
