My A4000 in MiragePCI tower works very well. And so does my friends A4000 with a Mediator4000Di. It's worth buying in you calculate with the costs of Zorro upgrade cards and the speed gain you get from the PCI side... no question about it.
Personaly I would not use a Voodoo5 card in the machine. You will do better with a Voodoo3 cause: it's smaller so won't block a zorro slot, there's no real speedgain between Voodoo3 and Voodoo4/5 cause the drivers are made for the Voodoo3 witch results in some modes doesn't work with 4/5 and the second GPU on the bigger card doesn't get utilitized, due to the second GPU not being used you can only use half the memory available on the bigger card, although the Voodoo3 does get quite hot it's nothing compared to the 4/5 witch requiers extra power to the card and have 2, noisy?, fans.
I have two Voodoo5 5500 cards, a Voodoo3 3000 and a Voodoo3 2000 and I use the 3000 in my machine... before I go the 3000 model I used the 2000 model. The Voodoo5 are for backup just in case and they are resonably good on lowend PC's without AGP ports.
