Features: brand new and high quality PCIe 2.0 (2.5gt / S) or (5GT / s) core specification. Complies with quad port 1GbE PHY device. IEEE802.3 standrd MDI (copper) Ethernet interface for 1000BASE-T, 100BASE-TX, and10BASE-T application (802.3, 802.3u and 802.3ab). PCI Bus Power Management Interface Specification Rev1.2. Supports a maximum of 9.6 KB of jumbo frames. Support flow control: send / receive pause frames and receive FIFO thresholds. Statistics for management and RMON. Support VLAN 802.1Q. Supports 64-bit addresses for systems using more than 4GB of physical memory. IPV6 activation filters. TCP segmentation download: up to 256KB. IPV6 support for IP / TCP and IP / UDP receive checksum offload. Interrupt control to limit the maximum interrupt rate and improve CPU usage.Receive split packet header. DCA support. Supports virtual machine device queues. Supports operating system:Linux, FreeBSD /Server2003/Win7/Win8/Win8.1/Server2012/Server2016/Win10 32 / 64bi. Specifications: Chipset:Intel 82575 Ethernet Controller Port number: 4 x RJ-45 Standard:IEEE802.1P, IEEE802.1Q, IEEE802.3 10Base-T, IEEE802.3u 100Base-TX, IEEE802.3ab 1000Base-T standards Data speed:10/100/1000 / Mbps Interface:PCI for express 1X Size:approx. 120x18x158mm/4.72x0.71x6.22in 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. Package includes: 1PC x Network Card 1PC x Short Iron Piece