Supermicro - AOC-URN4-m2TS-O - Riser Card 1U 2-Port 25GbE SFP28 PCIe 3.0 AOC-URN4-m2TS-O - Supermicro - 1U Ultra Riser 2-port 25GbE SFP28 Mellanox ConnectX-4 Lx EN, 1 PCI-E 3.0 x16 (internal), 4 NVMe ports $313.94
Supermicro - AOC-2UR68-M2TS-O - Riser Card 2U 2-Port 25GbE SFP28 AOC-2UR68-M2TS-O - Supermicro - 2U Ultra Riser 2-port 25GbE SFP28 Mellanox ConnectX-4 Lx EN $290.37
Supermicro - AOC-2UR68G4-M2TS - Riser Card 2U 2-Port 25GbE SFP28 PCIe AOC-2UR68G4-M2TS - Supermicro - Ultra Riser Card 2U 2-port 25GbE SFP28, based on Mellanox CX-6 LX, 1 PCIe $446.29
Supermicro - AOC-URG4N4-I2XT - Riser Card 1U 2-Port 10GBase-T RJ45 AOC-URG4N4-I2XT - Supermicro - Ultra Riser Card 1U with 2-Port 10GBase-T RJ45 $338.88
Supermicro - AOC-URG4N4 - Riser Card 1U PCI-E 4.0 x16 AOC-URG4N4 - Supermicro - 1U Ultra Riser with 1 PCI-E 4.0 x16 $121.28