i have core at 685, shaders at 1500 and mem at 999. when i isntalled rivatuner i just opened it and there everything was, in terms of overclocking the shaders serperately; i found that it did give a performance increase when checking my 3dmark06 score. I did have the core at 700 but it wasnt stable and temps werent safe. I am only new to this and basically followed clunks overclocking guide and various other things, but this website
Overclock.net - Overclocking.net will help you with everything. its american based so forgive them, but really useful.
fresh