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Where do I get a 680 for any price??
If you're @1080 i think either will do just fine. I have my 680 running 1200/7000 @1600 and have no complaints at all.
I am running @ 1440p atm.
Extra power is always worth it.
Amazon.com
Newegg.com
Ebay.com
Tigerdirect.com
Buy.com
Seriously, you live under a rock or something?
The performance difference is practically nil, but compared to new prices, you're getting a better bargain on the 680 which might help mitigate some of the loss later when you resell it.