sorry about the previous message, the exact clocks are, 520/1380, is there anyway to overclock further than this?
Yes you can increase the stock clock speeds of the card, but whether you'll get very far isn't clear.
i would leave it as it is, the card you have is currently one of the fastest 3 available ( not including cards designed for server/workstation usage.), and with the system you have you can run all the current games at the highest settings, so the small amount you would oc it would probably not be visible. and i notice you are intending to oc ur processer, if you are you really shouldnt bother trying to oc ur gpu,.
It depends on many factors including Cooling, brand of the card and quality of the silicon used. I'd guess you'd get it to 550/1450 on stock cooling. If you get a aftermarket cooler, it's almost garunteed you'll get higher overclocks, but don't expect too much!
I would leave well enough alone. That is the fastest gaming card in the world and OC'ing it voids the warranty, so if you fry it you're up you-know-what creek.