The st1000spexd4 pci express dual port gigabit network card lets you add two gigabit ethernet ports to a client server or workstation through a single pcie slot each port provides 101001000 mbps capable ethernet and is fully compatible with ieee 8023uab standards suitable for any standard pci express enabled system the 2 port ethernet card supports full duplex flow control for maximum data transfer speeds of up to 2000 mbps an ideal 2 port nic for setting up dual homed or multi homed