49Y7983 IBM X520 Dual-Ports SFP+ 10Gbps Gigabit Ethernet PCI Express 2.0 X8 Network Adapter by
Intel X520 and X540 Dual Port 10 GbE Adapters for System x and ThinkServer Product Guide (withdrawn product) > Lenovo Press
Amazon.com: 10Gb NIC PCI-E Network Card for Intel X520-DA1(Intel E10G42BTDA), with Intel 82599EN Controller, Single SFP+ Port, 10G PCI Express Ethernet LAN Adapter Support Windows Server/Linux/VMware : Electronics
Intel X520-DA2 Dual Port SFP+ 10GbE NIC Ethernet Server Adapter Yottamark! | eBay
Dell X520-DA2 Dual Port Network Adapter
Dell Intel X520-T2 Dual Port 10GbE SFP x8 PCIe NIC Low Profile | GCCFM - ECS
IBM Intel X520 10GbE Dual Port SFP+ Embedded Adapter - 49Y7980 - Walmart.com