remember i p-lan on SLIing two of these card, although i will definetely be selling the second card off straight off because i really dont need that kind of power!
my current setup:
i5-2500K (OCed to 4.8Ghz with arctic freezer pro 13 co cooler)
a Gigabyte GA-Z68XP-UD4 mobo
4gb 1600Mhz ram
an antec DF-30 case
windows 7 64bit
i think thats most of it!
oh and my current graphics card setup is SLI gts 450s (performance is ok i geuss but lacking in some games)
i am currently gaming on 2 1080p monitors but am likely to go to two 32" 1600p monitors (on the company too).
first off i should mention that power supplies waste the least power when they are running at about 50% max load. above 50% is still pretty effecient. but under 25% they always do very bad.
why game on two monitors? puts your crosshair/character split between screens. 3 is the way to go. and with that in mind the radeon is the way to go. need two nvidia cards to do triple monitor gaming. but i also perfer the 6990s performance to the 590.
for which card is the best its really down to warranties and reviews for me. i would rather have zero problems than 1% more performance. and i really dont like spending 10 hours on the phone for an rma number.