Guys, whether it's a C2 or C3 chip doesn't matter as much as the individual chips' ability to run at high speeds and you can only know that by testing a given chip.
Improvements with steppings are no guarantee of anything, rather these are supposed to be improvements to the chip and normally you have a better "Chance" of getting a good clocker with a newer/better stepping - Note I said "Chance", not that it actually would be better with any given chip with a newer stepping vs an older stepping.
Going back to Socket A's as an example, there are some AIUHB T-Bred chips that would clock well and even beat out some of the JIUHB examples since the JIUHB's are supposed to be the best you can get for those - Of course the JIUHB's are the newer stepping between the two.
I have both examples here and my AIUHB will smoke my other JIUHB chip hands down but normally it's the other way around when comparing these two steppings for "On Average" results when looking around for results on these. Either my AIUHB is a really good chip or the JIUHB is simply crappy. Got the JIUHB chip since it had the good stepping but knew going in it was a crapshoot whether it would be a good chip or not.
For the record, I believe my particular "J" chip to be crappy and my "A" chip to be a good one.
As for my take on this, I've noted C3 chips do tend to clock higher than C2's on average by a small margin but nothing to say these are clearly better. The chip in my sig is a C2 and does well enough as is and is clearly comparable to C3 chip results. I do need to get another since I suspect it has a problem with it's IMC but aside from that, it's good and does what I need it to.Edited by Kryton - 1/31/10 at 8:37am