I own an older PC system, also a K6-II. It runs both mandrake and Win2K, the latter under duress :-)
I use it for music recording/mastering, internet, programming, even testing some amiga code under UAE. It's basically a tool for doing donkey work.
It's also a jukebox whilst I'm working on the amiga (both share the same monitor via a KVM).
Both machines tend to be on at the same time but the amiga is usually my principal focus. I use it for music composition and programming as well as the occasional retro gaming session :-)