Asus USB 3.1 TYPE-C CARD Model USB 3.1 TYPE-C CARD Type: PCI Express to USB Card External USB Ports: 1x USB Port External Ports: 1 x USB 3.1 port [Type C] Backward compatible with USB 3.0/2.0/1.1 interface Internal Ports: PCI Express x4 interface (run @ x2) Compatible with PCI Express x4, x8 and x16 slots Operating Systems Supported: Windows® 8.1 32/64-bit Windows® 8 32/64-bit Windows® 7 32-bit Windows® 7 64-bit Dimensions: 3.12 x 2.90 Weight: 0.4