(after thinking quickly) That would probably be the Geforce4 Ti4200, which came standard with my dual-ghz G-4. Oops.
B) Generally speaking, games and graphic design programs tend to be the most system intensive things you can run on a computer. This is especially true the farther back you go. Frankly, I don't think a person knows squat about computers until they have spent an hour trying to edlin a system file to get 2 more Kb of base memory by forcing a driver up into extended memory. DOS really required some serious knowledge and tweaking...
Thomas Sowell pointed out in his Knowledge and Decisions that the function of technology is to reduce the amount of knowledge that an individual has to have in order to perform a certain action. Macs exemplify this. Boris was right when he called the PC users tinkerers. I liken it to the choice between manual and automatic transmissions in cars. If you want ease of use, you go with automatic. If you want performance and control, you go with manual. If you don't want to know anything about computers, get a Mac. If you want to get the best performance out of one, get a PC...