Typed in 650Ti overclocking, it was the first result in Google <shrug>
That is reasonable, doesn't seem to quite hit 40% average but it is close, although not a big fan of AR pricing in general you could save a few bucks on the 650Ti you have listed if you were actually going to use the rebate(different 650Ti on NE).
Still waiting to see the 60% from team red's Rollo
No, I don't across any set of benches. I linked OC 7870 to 650Ti numbers and they didn't hit 50% on average. There are some benches where the 7870 is close to 70%, others where it is close to 15%. On average, the 7870 overclocked failed to hit 50%.