The VisionTek USB 3.0 PCIe 2-Port Expansion Card lets you easily harness the power of your computers fast PCI Express card slots to add two SuperSpeed USB 3.0 ports for external drive data transfers up to 600MB/s.* That’s nearly 10x faster than USB 2.0! Besides getting a massive speed boost, the VisionTek Expansion Card’s two ports are bus-powered so most drives can be used without their bulky, unsightly power adapters. And for further convenience, the card also supports hot-swappable storage connections. Add and disconnect external drives and other USB 3.0 devices as you please!