gtx 690 all day but if you on a budget 560 ti will do just fine
Best single GPU is the GTX Titan
Best Dual GPU is the AMD HD 7990 (Similar to ares II)
Best to go with should be 4-way SLI GTX Titan
Well the Titan and the 690 are two of the best out there since now.
The 7970 is a monster too, but I remember I watched a video a while back comparing these cards and some other ones, in different games/scenarios and the 7970 got destroyed by the Titan and the 690.
There are some other cards such as those Tesla things, but I don't think you will actually need them, since only massive video/3d editors use them, and they are not good for gaming since they are built in a different way.
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I would suggest a Titan, since its the best one, but its also a little bit expensive due to its 'brand-newness'
I got one for my birthday, its what everyone calls it, the ULTIMATE experience. ( plays 99.9% all games with full settings )
Nvidia GeForce TITAN is the best
GTX 690 LOOKS BEAST
Tesla T20 or 690 i think..
also titan's 3 way SLi or 7970's crossfire is good too.
Double GTX geforce gtx 690 = 8GB or Double GTX geforce Titan = 12GB
sure GTX690 is the best on marked ,
as far i work with GTX660 Ti GDDR5 3 GB works kick ass to
2 GTX 690 SLI+Ati 7970 SLI BAM Link them up (how you ask? I dont care just fuckin do it!) xDDD
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