core i5-3570k or core i7-3770?

[Caleepzo]

just wondering if what processor are stable on playing full speed games like WWE 13. I'm planning on upgrading my processor but I can't seem to choose between the two. also, I don't know how to overclock processors so I guess the 3570k is pretty much useless to me. I just want to play WWE 13 on a system that isn't requiring too much work, like overclocking for example. right now I can play the game on 30-40fps per second, but I wanted to play the game on full speed? could any of you guys help me on what kind of processor is best suited for the game? without overclocking? thanks.

Motherboard:Asus P8H61-M LX Plus R2.0
GPUalit GTX 680 Jetstream 2GB
CPU:Intel Core i3-2120 3.3GHZ
RAM: Kingston 8GB
PSU: Turbo-X 600w