Mellanox ConnectX4-LX MCX4121-ACAT 25GbE Dual Port Ethernet LAN Adapter PCIe Low Profile Card with Low Profile Bracket and attached Full Height Bracket 25/10 Gbit/s Autodetect PCIe 3.0 x 8 with SFP28 cage for SFP28 optical transceiver moduless, 25G DAC (direct-attach copper cables) or 25G AOC (active optical cables), 10G SFP+ optical transceiver modules, 10G DAC or 10G AOC. RoCE RDMA..