I have a pair of 4870X2's mounted in the first two 16x pci-e slots with the crossfire bridge.
How would it affect performance if I put the 2nd card down onto the 8x slot near the bottom of the motherboard disabling crossfire ? (to aid cooling)
What will the 2nd card be doing as it is not then helping its brother in crossfire ?.

The reason I ask is that having 2 cards jam-packed together makes them run a bit hot.............I hold down the temps when gaming by raising the fans on each card to around 75% keeping temps down to about 50C, otherwise they creep up to around 70-80C. and just worried about the longevity of the cards as it will be when a blue moon appears before I will be able to buy new gfx cards

Thanks in advance for any info.