The quick answer is take the maximum speed of your
FSB and multiply it by 20.5. For most of you, this will mean they
haven't made a cpu that you can't run in your board. I don't care who
made the board or what model it is, this is the only thing that
matters, barring initial design flaws by the manufacturer. The one
thing that you can't do is use the bogus FSB numbers. Example: the FSB
of the 2800+ is 166MHz,
NOT 333MHz. The official minimum FSB
speed for all K7 CPU's is 50MHz and the maximum is 166Mhz. Although
both of these numbers can be exceeded in either direction.
So if you have a 1st generation KT133 (non-A) chipset, then the fastest
you'll get your FSB to is about 116MHz. this would limit you to
2378MHz. That would equate to approximately the speed of a Athlon XP
3000+.
I believe all the other information that is required to use these
faster cpu's is contained in the other cpu articles on this wedsite.
Read them and you should have a good understanding of how this works.
And be sure and follow the links. They provide excellent info.
Updated: 4/04/03
It's now known that the top multiplier is 24x. This was discovered
with the introduction of the B core 2100+. Several people (including
myself now) have installed this cpu in a KT133 chipset board (Abit
KT7's) and it booted without modification at 2000MHz default (20x100).
Also see
multiplier cross
reference on this site.