I have the XFX 6870, the reference version with the single intake in the back of the card, however, the exhaust is split into two parts, one of them points out of the case but the other blows the air in. I was not really happy with the extra hot air getting back into my case, so I have taped over it.
Looking at the disassembly pictures it looks as a single stream of air divided between those two exhausts, could there be any problem with this? The temps are 65C incl. overclock and fan running on 40-50%.
Anything I should be worried about?
I don't think it' a problem. I have messed around with doing this on my cards as well, and haven't found it a problem. The temps are good.
One thing though, all the XFX cards have the XFX logo stamped into cutouts on the exhaust port on the plate. IT looks pretty restrictive to me. I'm tempted to get the dremel out and open the exhaust port up all the way and see if it helps temps. I bet it lowers the noise a bit too, less turbulence of the exhaust air.