I'm getting this weird reading on my 4870x2 showing 345% idle activit! That's insane! I'm using the 8.8 drivers that I downloaded from guru3d.com. . The performance is outstanding with these drivers in games though. Also gpu-z detect three gpus?
Good games. Call of Duty 4, Lost Planet, Call of Juarez, Mass Effect, GRID. You should be able to crank these up, 4xAA+, 16xAF, maximum in game settings and see some noticeable improvement over a 8800 GTX at most resolutions.