Hi! i have one of those powerbooks 500 with a nupower PPC 630e at 117mhz, and like you said... that's a really solid notebook, the innards are made of steel! 8-o , very impressive.. i don't know if it runs great cuz my pb540 doesn't even turns on (psu misconection blow something inside). any way.. is a rock solid machine.. don't let it go away