Utilizing a high-end chip controller, it surpasses conventional USB 3.1 speeds, delivering 20Gbps transfer speeds. The product features a built-in power supply module, eliminating the need for an external power supply. A 15-pin power connector is also included. For higher current, an external 15-pin power supply can be connected. The carefully designed alloy heat sink fits snugly with the controller chip to quickly dissipate heat, preventing performance degradation caused by high temperatures and ensuring speeds even for long, large file transfers. PCI-E x4 card slot, compatible with PCIE x4/x8/x16 slots. Highly gold-plated PCI-E gold fingers: Strong oxidation resistance, excellent conductivity, and wear resistance. Driver-free, plug-and-play. Product Name: PCI-E x4 to Type-E USB 3.2 20G Expansion Card Input Ports: PCI-E x4, x8, x16 Speed: USB 3.2 GEN2*2 20Gbps Color: Black Material: PCB+Metal Package Contents: 1*PCI-E to TYPE-E 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.