WD_BLACK SN850X 4TB SSD, M.2 2280 NVMe SSD with Heatsink, Read speeds up to 7300 MB/s, Write speeds up to 6,600 MB/s, Gaming Expansion SSD, PCIe Gen4 NVMe, High Performance Internal SSD, Black - PCIe 4 M.2 - Heatsink Version - 4 TB - Up to 7300 MB/s