How much gaming can I do with this rig?

[Daris Mujkic]

Hello, this is my rig:
CPU: Intel Core 2 Quad Q6600 2.40 GHz
GPU: Nvidia GeForce GTX 660 1.5 GB
Storage: 1x200 GB hard disk + 1x100 GB hard disk
RAM: 2x2 GB DDR3
Motherboard: Gigabyte EP45-UD3LR
Monitor: 17 inch LCD
Accessories: Gaming mouse, standard keyboard, gaming headphones, standard webcam, standard controller

Can I play ALL games on 30+ FPS?
Typically Normal or Low in some cases on 720p?
What games I can't play, taking in the fact I may overclock my CPU from 2.40 GHz to 2.85-3.00 GHz