OC'ing requires good quality hardware to be effective and reliable. OC'ing also voids warranties.
Prebuilt- Brand Name & Model Number
Custom Build- Brand & Model of Mobo-CPU-RAM-Graphics-PSU
Is there any particular reason you want/need to your 3.33GHz OC?
Is it lacking in performance?
We have a beginner's OC'ong guide located at the top of this section: if you are new to overclocking / read here for starters