first off depending on the laptop, you may actually be able to change the graphics card, also you can change the processor, i've seen it done but you're very limited by the socket type and it requires you to completely tear your laptop appart, check to make sure that your laptop supports the type of combination you are thinking about getting, i know i recently bought a 256 chip of ram for an older laptop which didn't work because i found out it only supports 128meg chips, in regards to how much you should buy, i'd think 1.5g would be good if your computer would support it because you don't have a dual core processor i'm not sure you could take full advantage of 2 gig so it may go to waste, i don't think it would hurt anything if you wanted to go for 2 gig anyway
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