Re: 7800gtx 512mb
It shouldn't. If it does, you need to complain to DFI for making such a piece of crap motherboard. I mean the 7800GTX are SLi compatible. DFI has to assume that people will be setting the video card to SLi mode so they have to leave adequate room for two of them, no matter how big the video cards are. There's got to be a standard too as to how thick those video cards can actually be too. I wouldn't worry about it. I'm going to assume that you can put 2x 7800GTX 512MB in there without a problem. Tight squeeze, maybe, but it should fit.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?