I built and tested dozens of PC configurations around seven or eight different BP6's, and've seen it all.
Some BP6's were great (100% rocksolid stable to this day), while others were never ran right from the beginning (FYI, while some were rev 1.0 and others were 1.1, that never seemed to make any difference).
I learned a couple tricks (to making BP6's run properly) you guys might find interesting:
Never use a GeForce, it draws too much current. The GF2 might be ok (it has a smaller die size and draws less current) but I don't know, as I've never cared to test it.
Don't overclock FSB beyond 100mhz! Well, unless you've got some kind of cryogenically cooled crap going on that we don't know about. Just be grateful your Celerons will make that leap that far! (BTW, lowering latency is far more effective for increasing performance than jacking bus speeds, so make sure you're using good ram, and have tweaked your BIOS *properly*)
And forget Prime95, if you're still even using that; I've seen it repeatedly fail to find instability that would later bring down Q3 (usually at a bad time, like in the middle of serious multiplayer deathmatch...). The best tool I could find (back in the day!) for testing BP6's was dual sessions of Unreal (in software rendering mode), each restricted to one of the processors (FYI, this requires a simle trick where you install unreal twice and rename the .exe, this'll fool the game into letting itself be run more than once at the same time).
BTW, I still have a never-used BP6 (it's one I got from Abit as a replacement for a dead one I sent back); I'd be glad to part with it for eighty bucks plus seven bucks or so for shipping.