The WD SN850x is one of the very fastest NVMe SSDs in the world, with its PCIe 4.0 connection, super-fast TLC NAND flash memory and high-speed controller offering some frankly astonishing speeds – up to 7300MB/s reads and 6300MB/s writes, not to mention random read and write speeds of 800K IOPS and 1.1M IOPS respectively. This puts it within the top echelon of SSDs – perhaps why we named it the best PCIe 4.0 SSD for gaming!