Features: brand new and high quality brand new and high quality for IEEE802.3,IEEE802.3u,IEEE802.3ab; Supports IEEE1588v1, Crossover Detection& Auto-Correction IEEE1588v2,IEEE80.2AS for time synchronization Support PCI for express specification revision 2.1 Supports 1-Lane 2.5/5Gbps PCI for Express Bus Supports 2.5G and 1G Lite mode Supports Virtual Machine Queue(VMQ); Supports quad core Receive –Side Scaling(for RSS) Supports full duplex flow control(IEEE802.3x) Wake-On-LAN and "RealWow!"Technology (remote wake-up)supports brand new and high quality Integrated 10/100/1000M/ 2.5G transceiver Specifications: Controller Realtek RTL8125B Bus Type: PCI for Express Revision 2.1 Bus width: 1-Lane 2.5/5Gbps PCI for Express Bus Connectors: 4 x RJ45 Data rate 10/100/1000M/ 2.5G Applicable Network Type: Gigabit Ethernet Network Standard: IEEE802.11N Transmission Medium: Wired Port Type: RJ-45 LED Indicator: Yes Supports IEEE802.1Qav credit-based shaper algorithm Supports IEEE802.1P Layer 2 Priority encoding Supports IEEE802.1Q VLan tagging Supports IEEE802.3az-2010 Supports IEEE802.3bz-2016(NGBASET) Size approx: for Big Chassis 120x74x55mm/7.42x2.91x2.16in / for Small Chassis 80x74x55mm/3.15x2.91x2.16 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.