My professor has tasked me with coming up with a design for, and building, a graphical machine for connecting with my school's cluster computer. I think I'll be putting Ubuntu on it, and I've got a preliminary idea built up, but I had a couple questions for anybody doing graphics under Ubuntu.

Here's the machine so far:


Is anybody successfully running SLI with NVidia 8800's?

Is anybody successfully running a 9800?

Has anybody managed to get SLI with 9800s working(from reading around I'm doubting it, but if anybody has, that'd be awesome)?

Also, if anybody sees any hardware that is incompatible on that list I'd appreciate if you'd let me know.. I stuck to brands I've used before and the nforce/nvidia chipsets.

I'd appreciate any advice on building this system.