Look, please understand that I was not and am not trying to be argumentative here. However, even if you put the exact same processor, the exact same brand of RAM, PS, and PCI components in ANY board, you will get varying results; sometimes large variences. With CPU's alone, unless you get the exact same stepping chip that was made during the same production run, you can have varying results. You can find many such examples of this included in
this database on overclocking abilities of various CPU's. Just take a look at the 1.4 T-Bird for example and in particular at the K7S5A's in that lineup. There is one near the top that is water cooled but since we are keeping things "similar", of the ones that use air cooling, they go from a low of 1480 MHz to has high as 1579 MHz. Now, that is of course just those that posted to that site. There are probably many more. That is a large difference. Of the ones listed, they go from 138 FSB to 147. I have also seen as high as 166 and more. Ram can also be a crap shoot. Yes, generally speaking, if you get two identical sticks of say, Crucial DDR you will get very similar results; but probably not exact. However, you can probably get higher FSB with the more exotic RAM out there. Same goes for the HSF. If you have two exact HS's and fans you will get similar results. Problem is, if one person applies the thermal paste too heavy or too light, his results will be different (worse). Then there is the MB. OK, you said all things being equal but it is possible to even get a varience with two of the same boards; that's the world of overclocking.
OK, "lecture" over.
So, I will now give you an
"extremely generalized, no guarantee, can't say as I have seen it with my own eyes, YMMV, best as I can recall and go to that site I mentioned in my first post" kind of answer: I have seen posts of as high as 166 FSB and I believe I once saw higher (178). Don't remember who or on which site but I'm fairly certain that it was, again, (does this sound familiar), on the site I mentioned in my first post. You want a better answer? Call a psychic. J/K