cheers! are there guides for these things? or is it just trial and error? Sorry i don't want to annoy you too much but do you know what would be some settings to throw at a 580gtx to see any improvement or should i just let the auto tune take care of it and not worry?
Trust the autotune. Try tuning a couple of times, note down the configs and speeds that it found - and then pick the one that consistently puts out the highest kHash.
This is how I just found my 32x4 and 28x4 configurations for my GTX 560Ti and GTX 460 cards.
The thing is, with every cudaminer update, these ideal configurations can change. Even overclocking your card can move the ideal configuration to some other "sweet spot".
Christian