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
X520-DA2 10G PCI Express x8 intel 82599 ES Chip Dual Port Ethernet Network Adapter E10G42BTDA,SFP not included - AliExpress
Amazon.com: 10Gb SFP+ PCI-E Network Card NIC, Compare to Intel X520-DA2, with Intel 82599ES Chip, Dual SFP+ Port, PCI Express X8, Ethernet Converged Network Adapter Support Windows Server/Linux/VMware : Electronics
X520-DA2 - Genuine Intel E10G42BTDA
X520-LR2 - Genuine Intel E10G42BFLR
XYT17-HIGH P DELL / INTEL X520-DA2 CNA 10GBE DUAL PORT SFP+ PCI-E 2.0 X8 5.0 GT/S CONVERGED NETWORK ADAPTER - ( 2 ) TWO SMALL FORM FACTOR PLUGGABLE PLUS TRANSCEIVER SLOTS ( BRACKET PN: E33052-003 )