PCI Express x8 Dual Copper Port 10 Gigabit Server Adapter (Intel X540 Based)
Lenovo Intel X540 Dual Port 10GBase T Embedded Adapter for IBM System x - Office Depot
Amazon.com: 10Gb PCI-E X8 Ethernet Converged Network Card Compatible for Intel X540-T2, Dual Copper RJ45 Port with Intel X540 Chipset, Ethernet LAN Adapter Support Windows Server/Windows/Linux/ESX/Vmware : Electronics
Intel X540-T2 Dual Copper RJ45 Port 10GB Ethernet Converged Network Adapter X540 Chipset PCI-E X8 NIC
Amazon.com: 10Gb PCI-E Network Card NIC, Dual RJ45 Copper Ports, Compare to Intel X540-T2, with Intel X540-BT2 Chip, PCI Express X8, 10Gbase-T Ethernet LAN Adapter Support Windows Server/Windows/Linux/VMware ESX : Electronics