The ST1000SPEX42 is 4-port Ethernet card is an IEEE 802.3/u/ab standards compliant PCIe network adapter, which adds connections to up to four separate high-speed gigabit networks from a single desktop client, server or workstation. Suitable for any PCI Express (x4) enabled computer, this gigabit Ethernet network adapter card offers a practical, cost-effective resource for business, corporate or government environments, with support for high performance 4-channel networking and maximum throughput up to 1000Mbps in each direction (2000Mbps total) - up to ten times faster than 10/100 Ethernet.