doesn't want to or can't prove us wrong
the Geforce 3 would care less if it was on a PCI or AGP slot, unless:
-you need system memory for textures
-you are running games that max out the PCI bus with T&L data from the CPU.
if your case is B, then you shouldn't even BUY a Geforce 3.. the whole point of the GF3 is to be good at high polygon count games that require T&L data IN HARDWARE, in which case the PCI bus isn't utilized much at all compared to normal games.
in Quake 3, sure you can run a Geforce 3 on a PCI bus.. at low res you'll see a performance hit compared to AGP, but when you're running older games on such a powerful card, you normally don't even run such low res.. I would suspect that you would run 1024X768X32 + resolutions, where the video card is more limiting (still) then the PCI bus ever would be.
the short answer to this comment {Waste of money...end of story) is that you are wrong.