If you have a large enough case, just put a really big air cooler on it and it should run 4 GHz in the 70s or lower (IIRC) - unless you live somewhere where it really hot and you don't have AC. Seems like the easiest fix for better gaming.
Opt.2: Save your pennies and build a new system when Intel Skylake comes out (~18 months).
I don't live at Hot Place.
Couple of months ago we had a cold front and our sunny day l@@k like this

I do have an A/C but I get to use 4 months every year hee ee :twisted:
Waiting 2 years .......... Yikes
or I shall go toward APU AMD side :ninja:
