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I thought about doing that when I built my last PC, but just opted for the one graphics card board. I discovered that you didn't get double power, it just split the power.
I don't know where you get that idea, but it's wrong.
When it comes to the performance results, the NVIDIA GeForce GTX 680 performed as expected and we were impressed. Our performance numbers significantly improved and our gaming experience was better! Of the nine benchmarks that we used we found that adding a second GeForce GTX 680 for SLI improved performance on average by 64% at a resolution of 1920×1080 and 84% at 2560×1600. All of our tests showed a larger benefit from running in SLI at 2560×1600, so if you are gaming on a 30-inch panel you will get bigger performance gains that someone on a smaller 21.5-24″ panel. Performance scaling was fairly solid and we didn’t run into any gaming issues on this multi-GPU setup, which is impressive seeing how this is the first public driver for the new Kepler core architecture! Then again, this is a $1000 setup, so it better work right!
NVIDIA GeForce GTX 680 2-Way SLI Video Card Review - Page 14 of 14 - Legit ReviewsFinal Thoughts and Conclusions
Now, you'll never get double the power...not from any dual card set up...but you do get a definite increase.
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