CloD and overclocking

[III/JG53_Don]

I was wondering if CloD actually benefits from extense overclocking of allready decent CPU, like the famous 2500/2600k, since I am struggling if I should wait for the Ivy Bridge in March/April or better give the Sandy Bridge a shot.

What I heard is that the game uses barely 60% of the first and 15-20% of the other 3 cores, so my conclusion would be that overclocking wouldn't do the game any performance profits in this present build?! Having this in mind, these CPU and its overclocking possibilities should do the job perfectly for this game and its future enhancements (dynamic weather, damage model for trees etc). without a need to upgrade for the next 2-3 years in terms of a new CPU.
Just an assumption by myself.
Would be nice to hear some enlightments on this topic from an owner of these (or equivalent) CPUS