Looking to buy some new ram with slight overclocking capabilities. I have a budget of $100-$150. I do little gaming, but a lot of video/audio editing and authoring. If I really need a gig. can I start with 512mb and add another 512mb down the line or will that be slower than one single module - 1 gig of DDR? What is my best value for my system listed below? 1gig. of really good memory might be too expensive for me right now. 

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