I use a prometheus in a 4000 desktop. Because of it's size and it's orentation to the daughter card, I have to run the 4000 with the top off. A 3000 desktop would have to be opened up the same way. Currently it lets me use a cheap voodoo 3 video card and a $10 8039 based nic card to browse the internet over broadband using miami TCPIP. It also supports Voodoo 4,5 and S3 VirgeGX cards. (Not VirgeDX) There is a firmware update being worked on that will allow other DMA based PCI cards to be used. Theoretically even a sound blaster probably. BUT... currently drivers only exist for a small list of PCI cards. If like me you'd be happy with a nice P96 RTG video update and nic card for your classic, then this might be a good thing for you. But it just doesn't support most other PC PCI cards right now. For what I need, I have been very happy with the upgrade and price.
Plaz