Not 100% sure, but I believe these are the clocks I am running at:
729c/1620s/1458s (maybe 1% lower, sitting on work comp, cant check)
I have regular GTX285, no overclocked edition. Didn't do stress test, but played AC2 for more than 2hrs yesterday at 2560x1600 with everything at MAX. Silky smooth and not a hickup.
Rest of my setup is AMD Phenom II 965 BE and 4GB 10666 1333mHz OCZ RAM
EDIT: Before this card I used a PNY GTX 260 Core 216 (10% overclocked) and had issues running same game smoothly. But still annoys me that Bad Company 2 barely saw any increase in performance. still lags from time to time.