WD Black AN1500 WDS400T1X0L 4TB RGB NVMe PCIe Gen3 x8 SSD Add-In-Card - Interface: PCIe Gen 3 x8 - Capacity: 4TB - Sequential Read: Up to 6500MB/s - Sequential Write: Up to 4100MB/s - Backwards compatible with PCIe Gen3 x2/Gen3 x1/Gen2 x4/Gen2 x2/ Gen2 x1 - WDS400T1X0L - 5 Years Limited Warranty