This is a HP 503746-B21 comparable Gigabit Ethernet PCIe x4 network interface card with a single open RJ-45 port that complies with IEEE 802.3 standards. It is based on an Intel 82574 chipset and is compatible with Windows and Unix-like operating systems. Providing 10/100/1000Mbs of network speed, it fully supports high-end servers and a variety of networking applications. In addition, this card supports high level VLAN filtering. The single RJ-45 operates over copper patch cable, allowing for an operating distance of 100m. This product includes both half-height and full-height brackets. All of our network interface cards are 100% compliant, and offer a cost effective solution for all of your network upgrade needs. With our certification test program, we guarantee your product will work right the first time.