Maybe take out your crossfire card? You certainly don't need it to run this at max res on Ultra.
I run the following:
AMD 5970
i7 930@stock
12GB RAM
CPU temp 55'
GPU temp 63'
Nothing special, I just cleaned out my fans and re-applied the thermal paste lately.
I used to run 2x5970 but crossfire was more trouble than it was worth, I found, both in terms of drivers and heat.
Running on just one HD7950, in 1440p / ultra, is too slow unfortunately. With CF the game is super smooth, but also the GPUs get super hot.
