the two 6600 cards i had would not go much over 430 for the the core and 620 for memory. i never run more than 375/575 on it though.pxc said:I wouldn't either. Although a 6600 (or unlocked NV43 core 6200) at 500MHz+ has more shading power, the slow 128-bit memory holds it back a lot. It might be possible to find shader heavy games where an overclocked 6600 beats a 9800 Pro at medium resolution (1024x768 or 1280x1024), but that will be an exception.
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Out of the 7 6200 and 6600 cards I bought, all did at least 525MHz stable on the core and 600-700MHz on the memory. I'd take the 9800 Pro over the 6200 if I was getting a card for free. Successful unlocking is only a 50% chance even with an A3 or older core, and NV43 6200s came in both 64-bit and 128-bit memory flavors.