PCI 3.1 architecture, the actual writing and reading speed is to 2GB/S. Two M.2 ports support NVME protocol, support 5 kinds of hard disks, and make the at full speed. has a strong heat dissipation capacity, so that the can work for a long time without affecting the speed due to heat. 2G hard drive speed, the computer is no stuck. The ASM1812 chip has strong compatibility. Product name: PCIE3.1X8 to dual M.2 expansion card Support interface: 2 x M.2 (NVME) interface Motherboard interface: PCIE 3.1X4 Color:black Material:plastic Size:180 x 55MM Package Contents: 1 x Expansion Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.