Quad Port 10Gb Ethernet Adapter - One Stop Systems
Amazon.com: 10Gb PCI-E NIC Network Card, Dual Copper RJ45 Port, with Intel X540 Controller, PCI Express Ethernet LAN Adapter Support Windows Server/Windows/Linux/ESX, Compare to Intel X540-T2 : Electronics
Intel X520 Dual Port 10Gb Direct Attach/SFP+ Server Adapter, Full Height | Dell USA