I've been lurking around various amd forums for similar info - not the easiest to find. I'm on a s754 setup, and got similar (but slightly slower) results. Here they are:
Looks like there's some evidence the 90nm winchester's clock for clock can be more performant in some instances. Dual channel memory advantage perhaps? More tests would have to verify this. Thanks for posting , it gave me some context as to whether or not my system was within an acceptable performance range.
My system specs
2800+ @ 2.318GHZ
4x257HTT, 211mhz MEM, 2-3-3-5
chaintech vnf3-250, 10/29 bios
eVGA 6800 GT 415/1150 [EDIT] - using extremeG 67.03 from valance