it's not all about temps what about voltage and stuff. But if you have a decent case to go with that i'd say 3.6 maybe 3.7
For starters, I would simply set your RAM for a FSB of 400 and 1:1 memory. That will get you close to 3.2Ghz.
Look at your Temps/Volts and go from there. 3.2 would still be a light OC.
It comes down to if the extra Mhz actually gets you muc. I know I everntually clocked my C2D back just a tad from my highest OC (Which likely was not even as high as I could take it) just so my fan ran more quiet and never noticed a performance difference.
So the e6750 can go much farther than Q6600?
I was more wondering how far I could take it, than actually intending to use it at that speed. I like it right now at 3.0 Ghz, which is 8x 370.
About the RAM, how can I tell if it is 1:1? I think it is running at 888 with the settings I have above.
Yes, it can go further. (Less Cores - Less Heat) Some people have gotten it past 4.0 on air.
Mind you I expect that was outside of a case and a better air cooler.