Riser Card: 2 Layer PCB Bard Designing.. Compliant with PCI Express 2.0, 1.1 Specification. 1-Slot PCI-E 1X to 4 Slot 16X Riser Card with High Speed USB 3.0 Cable. High Speed USB 3.0 Shield Cable is Flexible for 1U, 2U, 3U Chassis. Support 4 port high speed PCIe 16X card