I'd agree with assassin123.
Turbo Boost should see you reaching 3.7-3.8 GHz anyway. Maybe use a third party cooler like the hyper 212+ and you may see the Turbo clock speed held longer.
Besides, the CPU will only become a bottleneck if your GPU isn't one first.
Skyrim is a bit complicated...in the sense that, yes at 1080p, ultra settings, with a GTX 570, it's CPU bottlenecked.
However with a 560 Ti...idk. may be GPU bottlenecked first, though something tells me maybe not, as it's not supposed to be very GPU intensive.
But, in their performance review, they're comparing a 2500k locked to 3GHz with a 2500k locked to 4GHz.
No turbo boost from what i can see, so that may make a difference.
svj0hn, do u play skyrim?
Though if the OP doesn't want to OC, then that sort of settles the debate.
All i can say is, if you want to tap the potential of Turbo boost, get a third party cooler with some Arctic silver 5.