The 8800gt 256 is 400mhz slower, but when oc'd it does hold its ground. The 9600gt is not always faster either. At 1280x1024, the 8800gt 256 does dominate as well. I play cod4 at 1680x1050 with it on high settings with 2xAA, and my fps never drops below the 40fps mark.
I may have mine for sell for a good price soon, since i want to upgrade to an 8800gts 512.