Product name: M.2 NVMe To PCIe 4.0/3.0 x16 extension cabl Models:R13SD-WK 4.0 Transfer Speed: PCIe 4.0 x1 Gen4, 16G/bps (Max.) Transfer Speed: PCIe 3.0 x1 Gen3, 8G/bps (Max.) Length:60cm Adapted graphics card: RTX3090 RX6800xt, supports PCIE 4.0 / 3.0 graphics cards Use restrictions: The product is only for professional engineers, ordinary users do not support use, and old equipment 3 years ago does not support use. PCIe4.0 has high requirements on equipment, as long as extension cable is connected, the signal be attenuated. This product does not the full speed of PCIE4.0, the equipment is aging, the signal is poor or environment is not good, please reduce speed to use. (The product appearance and printed words depending on batch, but this does not affect use) Material: PCB colour: As Shown Package Contents: 1 x M.2 NVMe To PCIe 4.0/3.0 x16 extension cable Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.