product description : intel pro/1000 pt server adapter connectors : 4 x rj-45 ieee standards : 10base-t, 100base-tx, 1000base-t wiring : cat-5, unshielded twisted pair (utp), 4-pair data rates supp : 10, 100, and 1000 mbps bus type : pci express 1.0a bus width : x4 lane pci express, operable in x4, x8, x16 slots bus speed : 10 gbps uni-directional, (x4, encoded rate) 20 gbps bi-directional, (x4, encoded rate) controller-proc : intel 82571gb leds : 4 (1/port, link and speed) solid and blinking dimensions (l x w) : 167.6 x 19.1 mm height of end bracket : 59.7 mm * enables higher bandwidth and throughput from standard and low-profile pcie slots and servers * enables 4 gigabit ethernet connections on a single adapter, delivering increased bandwidth for slot-constrained servers and providing high performance, reliability, and low power use in two single, integrated, dual port pci express gigabit ethernet controller chips