Pci To Pcie, Upgrading PCI to PCIe Options

[aportman]

I have a question that has probably been asked and answered at least a 1000 times, but I cannot see to find the exact answer that I am looking for anywhere.

I am wanting to upgrade to a new Mac Pro Desktop system from my worn out and exhausted G4 desktop. I have a UAD-1's & M-Audio Interface on my present G4 Mac, which are PCI cards. Is there a way that I can convert these work somehow, so that I do not have to trash $4000.00 work of hardware and plug-ins? If these systems are now rendered useless, I think this is freaking ridiculous. I have probably $3000.00 in my UAD's plug-ins, and another $1000.00 in my interfaces.

What's strange to me is that all the music magazines (sweetwater, guitar center, etc) mostly sell interfaces that still only come with PCI cards.

Thanks for any direction you can provide!

Allen