Presto Gigabit Ethernet Pro PCIe Card Sold Individually Mac Compatibility:OS X 10.4+ ; Snow Leopard tested ; Xserve (with PCI Express slots)(Xserve (late 2006-machine ID 1,1) compatible Xserve (early 2008-machine ID 2,1) not compatible Windows Compatibility:PC (with PCI Express slot), ; Windows 7, ; Windows Vista, ; Windows Server 2003, ; Windows XP Jumbo frame support Part No. GE1000LA-E