Features: Independent Bridge Controller: No need to provide redundant interrupt resources on the motherboard, no need to consider insufficient resources. Independent resource cache-: By adding- a resource cache- chip, the compatibility is greatly improved. Independent power management: Independent power management system, the stability is greatly improved. Independent network control: Each network port corresponds to one controller, and the four network ports work completely independently. Plug-play, convenient and fast- ,support for WindowsXP/2003/2008/2012/WIN7/WIN8/WIN10 etc High compatibility, Compatible withIEEE802.3, 803ab, 802.3u, 802.3x, 802.1, VLAN technology10MB/100MB/1000MB network adaptive Specifications: Item: 4 Port Gigabit- Ethernet Network Card Main Chipset: RTL8111 x4 Bus width: PCI-Express X1 Connectors: 4 x RJ45 Data rate 10/100/1000M 1Gbps Applicable Network Type: Gigabit- Ethernet Transmission Medium: Wired- Port Type: RJ-45 LED Indicator: Yes Size:approx 10.2x6.87cm/4.01x2.7in Package Includes: 1 x 4-port Gigabit- Server Network Card note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.