Can anyone explain how they got win8 to play nice with all 6 cards? I've got 6x7870xt, on win8 x64, using catalyst 13.4, and even though all 6 are detected, the last one always has a warning in the device manager, with the error code 43. I've tried manually downgrading the driver to 12.6 (as i heard that was the last version to support more than 5 cards in windows). But windows won't let me do it, saying the driver is incompatible.