I’ve had these two Mellanox ConnectX-2 10 gigabit SFP+ network cards for years, used between my home unRAID NAS and my desktop PC for a fast, direct connection. The cards use a PCIe 2.0 x8 interface.

The cards work great. I’ve upgraded a lot of my hardware at home in the past year and just don’t have a place for them anymore. They’ve served me well for many years.