Noob need help OC new system


Jul 1, 2009
Hello everyone,
I just built a new pc. I do alot of gaming and would like to learn how to OC my new system.
This is what I have so far:

XFX nForce 780i 3 way SLI MOBO

GeForce 9800 GTX Plus Graphics Card

2 nvidia RAM sticks 2GB each (system is reading 2.5gb)

I have 1 120 mm fan on the rear of the case

Zero Therm CF800 CPU cooler

I am running Windows XP, I do own a copy of Vista 64 bit that I never used. I would also like your opinion on wether I should use it or stay with Xp for now. Im contemplating Windows 7, but not sure yet.

Could someone either tell me how to go about OC this system or refer me to a step by step guide for a first timer?

Please and thank you!!!!