I had the same problem with 2 8800 Ultras and a 6400+ BE X2 inside a Thermaltake Mozart Case. FYI, this case has no intake whatsoever for the mobo area... I couldnt see this from pictures. As dirty as it may seem, I have a fast/semi loud fan blowing directly into the side case (door removed) and I spray it with Co2(l) every few weeks because of the more dust built up without a side. It works quite well, also make sure you have good exhaust. I also ended up buying 3 slot fans and made some holes in the excess space.