Another RAM upgrade question

Hi everyone,
I know there seems to be lots of RAM upgrade questions here but hey thats what forums are for.
I'm looking to upgrade my macbook's RAM it's currently got 2GB (2x1GB)
Is it possible to purchase 1x4GB and put that with one of my current 1GB sticks to create a total of 5GB?
I would be interested to know if this is possible or if anyone has tried it.
Thanks in advance
Scott

This will work if your MacBook is late '07 or newer.

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