If you downclock the memory significantly, you will notice a drop in temps. But the main reason they have high temps in the first place is because they can't breathe in one mobo. I have two extra fans blowing at my 5850 and 5870, cause the 5850 does indeed go over 90C
I agree with dikidera, I have 10x5850's and I use floor fans to cool them down while they are hanging from PCI-E extenders. The hottest I let them get is 85 C. But majority are in the low 70's C.
http://www.target.com/Lasko-Speed-Box-Fan-20/dp/B0014IGKBU/ref=sc_qi_detailbuttonThanks! I'll run the rig flat and will also install additional (case) fans. Is it better to pull hot air out of the GPUs or blow cooler air towards them?
That speed box fan looks sick. Are you using those fans with your set up? Cheers.