Hope I didn't get your hopes up mate, I'm far from an expert on the matter. Sounded like you were discribing a lappy.
I've got a similar processor too: Quad core @ 2.4 ghz, but I've also got 1.5Tb of hard drives and 8gb of ram runnin' Vista, a GTS450 card and I've still gotta use the 3gb switch and anti-lag to make it run right.
Certainly sounds like you're down in the RAM department, compared to the processor. Depending on your OS of course.
I'm not familiar with your graphics card but it sounds like it's big enough although I've read that your cards memory draws from your machine's RAM and so a card that's too good for your machine will slow it down or something like that (sorry if that's wrong I got a memory like a sieve!).
I'm sure someone with more knowlage will help you out though.
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Serial pest
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