Interesting that you also have a SL9S7 stepping E6700 as I was curious (after GMX's post) what mine was as I couldn't remember of the top of my head and so I checked my notes and the IHS info is as follows:
INTEL '05
INTEL CORE 2 DUO
6700 SL9S7 MALAY
2.66GHZ/4M/1066/06
L629B326
I wouldn't mind comparing the two. Let me know if you're interested and we could try and create similar bench systems and give them a few rounds vs one another via distance