You can use MSI afterburner.
The Vram is clocked stupidly low as standard, and these cards are mostly vram starved, so you can easyly get +500Mhz on the Vram.
On the GPU clock, it depends on how locked down the bios is. I tweeked the bios on mine to unlock it, but some people are uncomfortable with that.
I would see how you get on using afterburner first, see if it allows you to raise the power target.
The stock clock is around 850mhz, You should be able to hit 1000-1100mhz on the stock cooler no problem - I managed to get around 1350 using a corsair H55 AIO liquid cooler.