Asus Prime B840M-A-Csm - Motherboard - Micro Atx - Socket Am5 - Amd B840

Asus Prime B840M-A-Csm is a micro-ATX motherboard built for Socket AM5 processors and modern DDR5 memory, offering a balanced platform for productivity and light-to-midrange gaming.

Designed around the AMD B840 chipset, the Asus Prime B840M-A-Csm supports AMD Ryzen 7000, 8000 and 9000 Series CPUs via Socket AM5, delivering broad processor compatibility for current and upcoming Ryzen chips.

Memory support is robust with four DIMM slots for DDR5-SDRAM in dual-channel configuration, ECC and non‑ECC compatibility, unbuffered modules, up to 192 GB total capacity and official speeds up to 7600 MHz, making this board suitable for demanding multitasking and workstation-style workloads.

Storage and expandability are well covered with three M.2 slots (two PCIe 4.0 x4 and one PCIe 3.0), four SATA III ports and room for up to seven drives in total. Hardware RAID (0, 1, 5, 10) is supported for users who need redundancy or performance-oriented storage configurations.

Connectivity includes 2.5 Gigabit Ethernet, HDMI 2.1 and DisplayPort 1.4 video outputs with up to 7680 x 4320 resolution, multiple USB ports including USB-C (USB 3.2 Gen 1 Type-C), and a comprehensive front-panel connector set. Audio is handled as 7.1 channels with S/PDIF out and front-panel audio support.

The board is built with practical features for builders: two CPU fan headers, two chassis fan headers, an 8‑pin EPS connector, three RGB LED headers, a TPM connector, included SATA cables and screws, and a compact 244 x 244 mm micro‑ATX form factor that fits smaller cases.

Typical use cases include a space-efficient home office PC, a creator workstation that benefits from high-speed DDR5 memory and multiple NVMe slots, or a budget-conscious gaming build leveraging Ryzen AM5 CPUs with discrete GPUs in the available PCIe x16 slots. Windows 10 x64 and Windows 11 are supported.

This grey Asus Prime B840M-A-Csm combines modern I/O, strong memory support and versatile storage options into an approachable micro‑ATX package, giving builders a future-proof AM5 foundation without unnecessary complexity.

• Socket AM5 support for Ryzen 7000/8000/9000
• 4x DDR5 DIMM slots, up to 192 GB, 7600 MHz
• 3x M.2 slots (two PCIe 4.0), RAID support
• 2.5 Gb Ethernet, HDMI 2.1, DisplayPort 1.4
• Compact micro‑ATX with RGB headers and TPM