depends on what your doing. Playing games you can get by on 512 with xp but 1 gig is better. just serfing net, downloading, burning and such 512 is good enough.
What do you plan on doing with the computer?
I'd try and get the gig if you can, its not like that's TOO much Ram, and you never know when you may need it anyways. If price is a problem, you could also try switching brands
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