you spent $600 on two video cards...when you couldve just picked up a single 7970. 1 X 7970 ~= 2 X 560 ti.
blaznwiipspman1
TC is running a 448 core GTX 560 Ti - roughly 5% slower then a GTX 570.
Dual GTX 570s, from comparing benchmarks, out performe a single HD 7970 without a problem. Usually by a good 25% or more (seen upwards of 50% on a couple of games at the high end resolutions), depending on resolution, game and settings.
I don't see how dual GTX 560 Ti 448 would perform worse than or equal a HD 7970.
The benchmarks I looked at did not have identical setups, so it would be fair to say a +/- 5% margin of error could be found when trying to compare SLI GTX 570 and a HD 7970. In the end though, 570s are on top. The 560 Ti 448s would be right behind the 570.
Now, it comes down to this. You run two cards that'll probably give a good 20%+ gain over a single 7970 in almost any given situation, but you end up generating more heat and using more energy to run your system. So, you spend another $290 for a second card or you sell off what you have and then you need to front the difference for the 7970 - which is roughly around $560.
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