acejam : nice build !! But does it run Crysis?
I don't see why it wouldn't [with Windows]. However I'm running Ubuntu desktop 11.04 x64 on this rig.
Is it stable with that 1200W PSU? do you overclock? how much power does the whole system draw with 3* 6990's?
I've been running it for 2 full days now with the3 cards, and so far no issues. It turns on and all 3 cards are in the default "1" BIOS postiion, so each GPU core is mining @ ~ 330 MHPS.
I turned them to position 2 as a test and was able to get ~365 out of each GPU - though my temps began to rise noticeably, so I bumped them down again. I'm not sure on the power draw as I don't have a kill-a-watt yet.
I'm a firm believer in trying to cram as much power into a single rig as possible. Buying (4) 5830's is cool and all - and yes the 6990's use more power and generate more heat - but if I can get the same BTC generation power out of two cards (versus 4) - why not go for it?