This is a HP 656596-B21 comparable 10 gigabit Ethernet PCIe x8 network interface card with dual RJ-45 ports that complies with all IEEE 802.3 standards. Based on an Intel X540 chipset, it is compatible with most Windows and Unix-like operating systems, and provides 10GBase-T network speeds that fully support high-end servers. In addition, this supports high level VLAN filtering. The dual RJ-45 port slot operates over copper patch cable, allowing an operating distance of 100m. Our network interface cards are 100% compliant and offer a cost effective answer for all of your networking needs. With our certification test program, we guarantee your product will work right the first time.