Super Fast, Over 61k on my 3dmark Vantage Score. Over 16K on 3dmark 11. Upgraded from a pair of 295's they run much cooler.
Requires a 1200 watt Power Supply. Cant really overclock more than 25mhz. $1729.00 was a little steep.
I purchased the set from EVGA The kit was nice with a few nice extra's. I adequate will do this is not for you. I wanted the best of the best. The ATI 6990 wins some tests, but lack PhysX. So Quad SLi for me.