I think there are a few things that should be clarified since there is such a wide range of advice in this thread.
- There are three types of card interfaces that often get mixed up. PCI cards have been around for years and are still used modems, sound cards, and some lower performance graphics cards. AGP replaced PCI for graphics cards a few years ago, though almost all systems still have PCI slots for other cards. PCIe (PCI Express) is a new slot that is supposed to eventually replace everything else, but right now it is mainly used for the graphics card in some new systems.
- While PCIe is theoretically faster than AGP, there is no noticeable difference in performance between them. Most newer systems use PCIe now, so you normally can't choose between them anyway.
- Most people don't notice a difference between the "professional" graphics cards (FireGL/Quadro) and normal cards (Radeon/Geforce). In fact the hardware is almost identical, for example between an ATI FireGL T2-128 (~$250) and an ATI Radeon 9600 (~$75). The first main differences is that only the FireGL is officially supported by ATI and PTC to work with Pro/E, so if you have problems and call for support, they'll only help you if you have one of those cards. Secondly, the drivers for the FireGL/Quadro are optimized for modelling software instead of games, so they can draw lines and such faster than normal cards. While the difference is significant, most normal cards already perform adequately.
- Most of speed of doing things in Pro/E has nothing to do with the graphics card. The graphics card only affects how smooth it looks (ie, how many frames per second it can draw) when you can move around and spin the model, either in wireframe or rendered. It does not affect regeneration times or constructing geometry.
- While I haven't seen any Pro/E benchmarks to prove it, I believe the amount of memory on the graphics card is usually not important. Even modern PC games, which have many times more objects and textures, are very rarely using all the memory available on modern cards. You probably can't buy anything with less than 128MB, and I'd be surprised if Pro/E ever uses that much. More memory won't make the card faster.
Edited by: MartinH