some 10+ it says, the clocks that I calculated go 13% or so....so I guess thats what they mean, don't forget that not all games benefit from OC.
We'll see, I think these tests are still beta tested, so drivers should even it out, doubtful we'll see 20% since the clocks don't show those gains, but 15% isn't far out of reach, especially in games like Stalker.
Though this card's OC is what might make it appealing, although it does drain like a beast, and must pump heat like a beast, so water cooling might be a benefit, or getting the ICE Q edition.
Fud says: power optimizations, so that might have something to do with drain and heat, but thats my opinion.