The WD_BLACK SN850X 1TB is WD's premium PCIe 4.0 NVMe SSD — a step above the SN7100 in sustained performance and the drive WD positions against Samsung's 990 PRO. ~7300 MB/s read, ~6300 MB/s write, with WD's gaming-tuned firmware and Predictive Loading technology that pre-caches frequently accessed game assets.
Double-sided design with optional heatsink for boards without built-in M.2 cooling. 600 TBW endurance, 5-year warranty. We fit this when the customer wants WD branding at premium tier — historically a slight pricing edge over the 990 PRO at the same capacity.