I dont understand why you are asking us... are you paying us to come around and find out? It'd be a lot cheaper to load the game and find out
As comparison, i have a 9800 (Pro) at 385/385 clocks it runs HL2 1280x1024x32 with 4xAA and 0xAF with perfectly fine fps 40+
Overclock your card, get the most out of it
~t0m