A Matched set of EVGA 7800GTX cards, both have been tested as main gpu in an old A8 APU system with the latest drivers supported, for their day, they where beasts, anybody looking to build a rig for retro gaming wont be let down, having owned both crossfire and sli from this era, sli tends to "just work" and works in games that are not true full screen, this is not true for crossfire.