Form Factor: PCIe adapter Network Card Brand & Model: Dell Mellanox ConnectX-5 Ports and Speed: 2x10/25GbE Interface: SFP28 Dell Server 14th Gen Compatibility: R440, R540, R640, R740, R740XD, R740XD2, R840, R940, R940xa, T640, C4140, C6420, FC640. Dell Server 15th Gen Compatibility: R450, R550, R650, R650xs, R750, R750xs, R750xa, R6515, R6525, R7515, R7525, C6520, C6525.