Games aren't really written to take advantage of quad core at the moment.
There is the odd one or two, Supreme Commander being the most notable with Alan Wake on the horizon.
If you want a kick arse gaming rig today then you need a fast 45nm duallie.
I run an e8500 at 4.2Ghz in my gaming rig.
You need plenty of CPU horsepower to keep multi GPU setups fed, with a single card as in the review any half decent chip will do though.
The 45nm chips are much faster clock for clock than the old 65nm stuff, so the wolfdales run rings round the q6600 for gaming.