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One more thing. Whatever configuration you go with, I would suggest you get your ram in "matched pairs". Meaning, one pack that comes with 2 sticks. Far better tuned and compatible that way.

You've kind of touched on something there that is a good reason for going to 4G, matched pais are particularly important on some memory controllers. On some boards not having matched pairs will cause the memory to throttle back into non-synchronous mode which is far slower then the memories potential, upgrading from something old the new ram will still be faster but if you want to maximise your investment in speed, then matched pairs are important.

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