I have a Power Tower Pro 200, owned it since 1996, it's been a great box running 8.5 with 208MB RAM.
Just installed a Newer Tech 500/250 G3 upgrade card and it really screams, don't know why I waited so long to upgrade.
One small problem, when printing as the print job is spooling, the cursor moves slow and jittery until the job starts printing in the printer. I don't know what causes this to happen, I have been told to remove the old L2 back side cashe from the mother borad.