Specification: Item Type:Internal Computer Networking Cards Material: PCB Main Control Chip: RTL8111G Bus Interface: PCIE (support PCIE X1 X4 X8 X16) Network Interface: RJ45 x4 Transmission Rate: 10/100/1000Mbps Product Size: (manual measurement allows errors) Length: Approx. 120mm/4.7in Width: Approx. 120mm/4.7in Height: Approx. 20mm/0.8in Support System: For Win XP, for Win7, for Win8, for Win8.1, for Win10, for Linux, Etc. 99% of the Operating Systems and Soft Routers on the Market, NAS, Virtualization, Etc. Package List: 1 x Internal Computer Networking Cards 1 x Driver CD 1 x Baffle 2 x Screw Note: Manual Measurement Allows Errors