Mine won't arrive until tomorrow so I can't tell you from experience, but other ppl that bought it have claimed:
gpu 700-725 mhz
1900-2000 mhz memory
shader 1700-1800 mhz
if your card is the model with the new, larger heatsink/fan design you should be able to hit these speeds or possibly higher if your case has good ventilation.
I'll try to remember to post my results here tomorrow.