What is the Mellanox MCX516A-GCAT?
The Mellanox MCX516A-GCAT is a QSFP optical transceiver module, listed by the manufacturer as "Mellanox ConnectX-5 EN Ethernet Adapter Card 50GbE Dual-Port QSFP28 PCIe 3.0 x16". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.