PCI-E Fiber Port 1G SFP Network Adapter 1000M SFP server Fiber Lan card | eBay
Intel X520 Dual Port 10Gigabit SFP Server Adapter Ethernet PCIe Low Profile | Dell USA
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Amazon.com: 10Gb NIC SFP+ PCIE Network Card with Broadcom BCM57810S Controller, Dual SFP+ Ports, Fits for PCI-E X 8/x16, PCI Express LAN Card Support Windows Server/Windows/Linux/VMware : Electronics
Intel® I210 F1 Single Port Gigabit SFP PCI Express x1 Ethernet Network Interface Card PCIe
385A-SFP PCIe Card with Intel Arria 10 FPGA - BittWare
Amazon.com: 10Gb PCI-E NIC Network Card, Single SFP+ Port, with Intel 82599EN Controller, PCI Express Ethernet LAN Adapter Support Windows Server/Linux/VMware, Compare to Intel X520-DA1(Intel E10G42BTDA) : Electronics
StarTech.com 10G PCIe SFP+ Card, Single Open SFP+ Port for MSA-Compliant Modules/Cables, SFP NIC - PEX10GSFP - Ethernet Adapters - CDW.com