It all depends on what you are doing. at the cad lab we use PRO-E which is pretty resource hungry, and we were running it on old dells with 256 ram and onboard video. (they were replaced the semester after I had my cad class and are all new now) of course we weren't modeling very complex parts, and if they got complex at all you had to suppress elements so they weren't taking up ram. it all depends on what you are doing with the programs. if you are modeling an entire car in PRO-E you are going to want a couple gigs of ram and a damn good graphics card.
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