Overclocking is easy, So with gpu tweak. I believe Asus have already overclocked it to 970mhz.
Go to your AMD overdrive in your catalyst control centre, and set the power limit to +20% (this will allow your card to drag as much power as it likes)
Now after that in gpu tweak move your core clock speed from 970mhz to around about 1050mhz. (what most 280x OC cards are at)
Run heaven benchmark and valley benchmark downloadable from here:
http://unigine.com/
If your computer crashes or anything crashes the clock has hit it's limit, go down 20mhz and test again. If it doesn't crash after a few loops of running these, increase the core clock maybe up to 1100mhz and repeat the benchmarks. If it crashes go back down.
After 1100mhz on the core clock move up in smaller increments of maybe 20mhz. Keep going until the benchmarks do crash, this means you have hit your limit. Go back down 20mhz. After that test stability on you favourite games. Mind to check your temperatures while doing the benchmarks and games.
Once you have found your limit that is your max overclock on STOCK VOLTAGES (no harm can be done to your card by changing the clocks other than heat)
You can increase your voltage which can damage your card in the long run, but get back to me after you have found your stable core overclock.
Good luck
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