The answer is probably. I'm currently running dual PIII 866MHz processors, however, they are underclocked to 650MHz (100MHz FSB instead of 133MHz).
My board currently has the
Q6 mod (with an LM317T), with EC10 replaced with a 1500MFD capacitor (suggested in
Yoichiro's PIII mod guide. I'm using two Powerleap S370s, with
their original suggested modifications (cut one trace on the S370s, and solder one wire per socket on the BP6).
I did the S370 & BP6 socket mod first, and I was able to get up to an 83MHz FSB, since I replaced EC10, I've been rock steady at 100MHz FSB. (The Q6 mod was done long ago by the previous owner of the board.)
My intention is to run through some more of
Yoichiro's modifications, and see if that will get me up to 133MHz. I'm also contemplating trying some of the further modifcations that
that friendtech suggested (the makers of the S370). I'm not so sure about mixing mods, I think that is probably a bad idea

.
Go for it though, with the PIII933s, you should be able to get at least a dual 700MHz system. Dig around through the
articles section of the page first. Lot's of good stuff, some of it hidden in the comments.
Jeff