I am running VC9 Pro on a 32bit XP Pro Box with just a dual core processor and 4gig RAM, and it seems to work just fine. I am running a PCI Express bus video card, and have the onboard card shut down. No more issues than with VC8 and a lot less than VC7. I have to say it was worth taking advantage of the initial discount, and the upgrade pricing. I was leary because some initial purchasers had installation and verification issues, but my install went flawlessly.
Bob La Londe
http://www.YumaBassMan.com