Supermicro - AOC-URG4N4-M2TS-O - Riser Card 1U Dual Port 25GbE SFP28 AOC-URG4N4-M2TS-O - Supermicro - Ultra Riser Card 1U with Dual port 25GbE 2x SFP28 $423.43
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-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-URN4-B2XT-O - Riser Card 1U 2-Port 10GbE RJ45 AOC-URN4-B2XT-O - Supermicro - 1U Ultra Riser 2-port 10GbE RJ45 $288.29
Supermicro - AOC-URN4-I2TS - Riser Card 1U Ultra AOC-URN4-I2TS - Supermicro - 1U Ultra Riser Card For Motherboards X11DPU, X11DPU-Z+ $395.71