Re: one memory stick or two?
Your motherboard is setup for dual channels. It will perform best with 2 identical sticks of memory. You can use 1 gig stick, but 2 512's may be cheaper depending on where you buy it.
If your machine can handle 2G's of RAM go with one, but be sure to get another down the road. If your machine's max is 1G then 2 512's is the way to go.
-Ryan
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