ASRock B860 Pro RS LGA 1851 Intel motherboard

Socket LGA 1851 ATX motherboard

The ASRock B860 Pro RS is an ATX motherboard built around the Intel B860 chipset and the LGA 1851 socket for Intel Core Ultra Series 2 processors. It provides four DDR5 DIMM slots supporting up to 256 GB of memory and dual-channel operation with Intel XMP 3.0 profiles. Expansion includes one PCIe 5.0 x16 slot wired to the CPU and one PCIe 4.0 x16 slot from the chipset running at x4 mode.

Suited for high-speed DDR5 and dual M.2 builds

This board suits builders who want DDR5 speeds up to 8666 MT/s and two chipset-linked M.2 sockets that accept 2230, 2242, 2260 and 2280 drives at PCIe 4.0 x4. The CPU-connected M.2 socket takes a 2280 drive at PCIe 5.0 x4 for 128 Gb/s throughput. Users needing more than four SATA 6Gb/s ports or additional full-length PCIe slots should consider a different model.

Deciding spec: CPU-linked PCIe 5.0 M.2 at 128 Gb/s

The single specification that decides fit is the CPU-attached Blazing M.2 socket running PCIe 5.0 x4 at 128 Gb/s. If the primary NVMe drive must connect directly to the processor at Gen 5 speeds, this board delivers that path; if the workload only requires chipset Gen 4 storage, a less expensive B860 design may suffice.