the quad xeon's x3210 and x3220 (s775) are the same as the q6400 (never retail released) and the q6600 respectively in terms of cache. They are all 8MB L2. Some of the 771 lowend xeons are only 4 mb cache but all the highend ones are 8MB.
The s775 xeons are just binned differently and will run on lower V (ie. VID will be lower). They may oc better due to the binning, but that is not the binning criteria ... lower power consumption and heat production is the objective since no OEM server mobos support oc'ing anyway.
But since the x3xxx xeons run s775, us oc'ers get our hands on them and find that they sometimes oc better than their desktop siblings.
I have found that x3210's oc about the same as b3 stepping q6600's but at slightly lower volts even with a lower multi. This is based on my 4 x3210's and 2 q6600's.
The x3xxx's don't show any new steppings (yet) so they are still b3. I will be trying out a G0 q6600 soon so the oc'ing vs volt balance may change in favour of the new q6600's.
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