All I know is the max boost clock is the set ceiling of the card. The absolute max frequency allowed.

You have to use software OCing apps in general to control Power Target, Voltage, Clocks, etc. So I'm not sure how you could do this without software apps.

To plug my own article , If you are wondering what GPU OCing App is the best or has the features you are looking for, give my article a read: http://videocardz.com/35604/gpu-over...ng-apps-review

It pretty much includes any software that works on all cards (no vendor specific software like TriXX) and even has an interview between the creator of RivaTuner (Alexey) and myself.