However, even if you don't OC, you should consider getting a better PS, given your power-hog graphics card. These days, what matters more than the overall wattage of a PS is how much +12V power it can supply.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.