COD has no MP vehicles, and few in the SP game. I run an slower version 2 ghz P4, 512 mb SD RAM, 9600 pro OC'd some, it runs fine on my pc at 1024*768. 60+ players online runs basically lag-free, only at the start of a round in some cases. But there is virtually no lag.
i play both games fine with my old pc (celeron 900, 256 mb sdram, PCI Geforce 4 64mb PNY) obviously with settings set to medium, i have a fast connection so its playable in bf1942 and cod, i get an average of 30fps in cod in most maps, the bigger maps i struggle a little, and don't know the fps of BF1942 but i can enjoy both games.
<P ID="edit"><FONT SIZE=-1><EM>Edited by Britdude on 12/19/03 08:55 AM.</EM></FONT></P>
Correct, the only vehicle driving you will do EVER in COD is in the single player Russian campaign. But that doesn't mean it isn't a good MP game, it is just infantry based. You still of course have vehicles (you plant explosives on them) in MP, just not drivable.
I just want to point out that Americas Army is free and is also a great military game. I haven't played it in a few months so there is a new version out but so far I think it's the best designed game. It discourages team killing, has punk buster, the graphics are good, and if shooting people is your thing along with the need for excellent strategy I think it's worth noting.
As far as buying a game I think BF1942 is tons of fun. I love flying the planes and sinking ships. I haven't tried COD yet though.