Increasing speed with an ATI Radeon HD5670

[BenAdamson]

Hey, I'm currently getting only around 1.2 Mhash/s speeds with my ATI Radeon HD5670, how can I boost this? From https://en.bitcoin.it/wiki/Mining_hardware_comparison it says that my card should be capable of much greater speeds! I've tried using bitcoin.cz and deepbit, I get less than 1Mhash/s on Deepbit and 1.2ish on bitcoin.cz! I am using the GUIMiner client on Windows Vista.
Thanks in advance!

[CNMOH]

Sounds like you're making it use your CPU.

[BenAdamson]

Ooh, that looks likely. Which mining client do you recommend in that case?

[BenAdamson]

I have got it to work mostly , now getting fairly decent speeds. Also, I am an idiot :L