ASUS Prime B650M-A II-CSM DDR5 AMD Motherboard

The ASUS Prime B650M-A II-CSM is a Micro-ATX motherboard built on the AMD B650 chipset, designed for the AM5 socket and compatible with AMD Ryzen 7000 and 8000 series desktop processors. Measuring 9.6 x 9.6 inches (24.4 x 24.4 cm), it fits a wide range of mid-tower and compact cases while delivering a feature set typically found in larger boards. Memory flexibility is a strong point: the board provides four DIMM slots supporting up to 192 GB of unbuffered DDR5 RAM, with native speeds at 4800, 5000, and 5200 MHz and overclocked profiles reaching DDR5-7600+ via AMD EXPO. Both ECC and non-ECC memory are supported, making this board suitable for light workstation duties alongside standard desktop use. ASUS OptiMem II trace routing helps preserve signal integrity for stable memory overclocking. Storage options include two M.2 Key-M slots (type 2242/2260/2280) and four SATA 6 Gb/s ports. With a Ryzen 7000 series processor, the primary M.2 slot operates at PCIe 5.0 x4 for maximum NVMe throughput; with a Ryzen 8000 processor it operates at PCIe 4.0 x4. The secondary M.2 slot (chipset-driven) runs at PCIe 4.0 x4 in both configurations. Connectivity on the rear I/O panel includes 2x USB 3.2 Gen 2 Type-A, 2x USB 3.2 Gen 1 Type-A, 4x USB 2.0 Type-A, DisplayPort, HDMI, VGA, Realtek 2.5 Gb Ethernet, three audio jacks, a PS/2 combo port, and a BIOS FlashBack button for BIOS updates without a CPU or RAM installed. The front-panel USB header supports a USB 3.2 Gen 1 Type-C connector plus additional Gen 1 and USB 2.0 headers. The board carries the ASUS Corporate Stable Model (CSM) designation, offering up to 36 months of product lifecycle support and a 6-month end-of-life notice — attributes suited to business and enterprise deployments. Bundled ASUS Control Center Express software enables IT endpoint management across fleets. A 3-year manufacturer warranty is included. Audio is handled by a Realtek 7.1 surround HD audio codec with dedicated PCB layers, audio shielding, and premium capacitors supporting up to 24-bit/192 kHz playback. Cooling infrastructure includes one CPU fan header, one CPU OPT header, and three chassis fan headers, all manageable via Fan Xpert 2+. Aura Sync RGB lighting is supported through one Aura RGB header and three Addressable Gen 2 headers. Verified Specifications: - Socket: AMD AM5 - Chipset: AMD B650 - Form Factor: mATX, 9.6 x 9.6 in (24.4 x 24.4 cm) - Memory: 4x DIMM, max 192 GB, DDR5 4800–7600+(OC), ECC/non-ECC, Dual Channel, EXPO support - Storage: 2x M.2 (PCIe 5.0 x4 / PCIe 4.0 x4 CPU-dependent; PCIe 4.0 x4 chipset), 4x SATA 6 Gb/s - Expansion: 1x PCIe 4.0 x16 (x16 with Ryzen 7000; x8/x4 with Ryzen 8000); 2x PCIe 4.0 x16 slots (x1 mode, chipset) - Rear USB: 2x USB 3.2 Gen 2 Type-A, 2x USB 3.2 Gen 1 Type-A, 4x USB 2.0 Type-A - Ethernet: Realtek 2.5 Gb - Video Out: DisplayPort, HDMI, VGA - Audio: Realtek 7.1 HD, up to 24-bit/192 kHz - BIOS: 256 Mb Flash ROM, UEFI AMI, BIOS FlashBack - OS: Windows 11, Windows 10 64-bit - Warranty: 3 Years