Notice: Pls update your bios as newest. Normaly it don't need extra DC power supply. USB 3.0 Cable is just bridge of PCIe signal, it can't work directly in USB ports of computer. ^^ Make it possible for PCI device to work on PCIe slot(Can't work in USB port directly) ^^ It allows to add 1 PCI device on 1 single PCIe slot ^^ Fit all PCIe x1, x4, x8, x16 slots on the motherboard