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Pros: I've upgraded from two 1GB ATI Radeon HD 5870's in crossfire, to two new EVGA GTX 680 4GB FTW edition 4GB cards in SLI. My system is an x58 running a liquid cooled gulftown i7 980x 6-core processor clocked to 4.2 GHz. There's an 875 watt PSU and 24GB of Kingston HyperX 1600 RAM (triple channel). It's a capable machine for a MicroATX PC. I game at 1080p on a 2ms Samsung monitor.
So I finally went green and switched to Nvidia. The Radeon HD5870's were OEM and I was actually very content with their performance over a decent span of time. However, AMD has SERIOUS driver issues that make a person want to rip their hair out... I could not take the updates anymore. Also, with several recent games such as Skyrim and a few other titles, the limited video memory was making play quality unacceptable.
There are many perks to the EVGA GTX 680's running in SLI. I was blown away with the quality difference in a great number of games. The Witcher 2, Skyrim, Battlefield 3, Arkham City, and Metro 2033 were being absolutely man-handled by the 680's. All games were played at MAX settings (or even higher through tweaks/mods). I had the Witcher 2 maxed out AND had ubersampling turned ON and these cards still ran the game very smooth, locked at 60 FPS.
My idle temps were ~34 C and ~38 C which is very nice. The cards are constructed and fashioned well. They are smaller than I had imagined. They do not generate noise. They are INDEED dual slot and no larger! (even with the backplate) The cards have a nice feature in the design of the heatsink shroud: the cards are slightly recessed at the fan end of the enclosure and this allows air to enter a bit easier if your PC case is compact.
EVGA customer support is incredible. They are good people. It is great that these cards come with a 3 year warranty too.
Cons: Arkham City had occasional stutters, but they were not offensive or disruptive and I don't believe the GPU's were to blame.
LA Noire ran noticeably better but there was just something off about the experience... the camera panned in awkward ways and it gave the illusion of lag.
Nvidia's new Vsync tech seems better left unused.
If you enter the Nvidia settings and set the cards for "maximum performance" instead of "adaptive" your cards will not save any energy and will stay at max video clock frequency state - potentially causing heat issues. My temps rose from ~34 C and ~38 C all the way up to ~46 C and ~54 C.
And the obvious... The cost is insane. It is the best single GPU card out right now though to be fair.
Other Thoughts: The new Metro game comes out in two weeks or so. Metro Last Light. I wish that I already had the game now so that I could really see what these 680's were fully capable of. I will try to update this review when I test the cards running on the new Metro game.READ FULL REVIEW