If my memory serves me correctly, a PM 5500 is a PPC 603ev based system. Since it is not running a PPC 750 (G3) or 7400 (G4) you are not going to be able to run VPC4. Bumping around on the internet for the past few weeks I have been reading the various articles and user comments about it. The best repository of user feedback and some technical comments is from Ric Ford's Macintouch site. The site is a daily read for me, along with Macnn
and many others.
Check out http://www.macintouch.com/vpc4.html
I think that you will find the comments to be useful. There is a letter in that repository that talks about Connectix using some of the newer features of the G3 and G4 and that precludes VPC4s use on anything older. But the good news is that people using G3 and G4 systems are enjoying a huge speed boost, in most instances.
I just noticed that you are using an accelerator card. I am unsure of the compatibility with the card, but since all processing on the system is being done by the card's processor, I would think that VPC4 would work just fine for you.
[This message has been edited by jeromep (edited 01-04-2001).]