I own two 5870s and every game runs fine, 60 fps blah blah. Whenever I start youtube and alt tab to listen to a quick song, my fps drops about 20. If I close it.. it goes back up to 60. Any ideas?
yeah, don't start youtube while gaming
actually sounds like a driver issue or the game's ability to use CF, instead of hardware. just for curiosity, disable one card and then start youtube while playing the same game. if your FPS is more stable, it's the driver/game for CF tying up too much of the CPU process ability.