This is a Mellanox MCX4121A-aCAT ConnectX-5 EN Network Interface Card, 25GbE Dual Port SFP28, PCIe3.0 x 8 network interface card with a Dual open Port SFP28 port that complies with IEEE 802.3 standards. It is based on an Intel XL710 chipset and is compatible with a variety of different applications and operating systems, including Windows, Linux and Unix-like systems. Providing 25Gbs of network speed, it fully supports high-end servers and various other networking applications. In addition, this card supports high level VLAN filtering. The Dual Port SFP28 allows users to choose from a range of SFP28 transceivers to accommodate multi-mode (MMF) and single-mode (SMF) fiber, granting customizable reach. This product includes both half-height and full-height brackets. Our network interface cards are 100% compliant, and offer a cost effective solution for all of your network upgrade needs. With our certification test program, we guarantee your product will work right the first time.