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My current laptop has 3GB (1x2GB, 1x1GB) of DDR2 RAM installed, and they run at 667MHz. I just ordered a new laptop, that comes with 2GB (2x1GB) of DDR3 RAM that runs at 1066MHz.

Is there any compatibility with the two? Can I install the 2GB stick in my old laptop in the new laptop, and have both DDR2/DDR3 and 667MHz/1066MHz operating together? Or should I buy a new RAM stick for my new laptop?

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up vote 3 down vote accepted

DDR2 and DDR3 are electrically and physically incompatible, sorry. You'll need to get new DDR3 SODIMMs if you want to upgrade.

On the plus side, I suppose, DDR3 happens to be the current best value for your money, as DDR2 production is ramping down due to it being "last-gen". OTOH, you could pawn off your DDR2 on Fleabay or something and quite possibly make up the difference. :)

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Perfect answer to my question, thanks! I can probably sell both sticks from my old laptop. Unfortunately it won't be computing for much longer. Great idea, and thanks again! –  teejmya Apr 29 '10 at 3:40
    
Hi @teejmya, if this answer was helpful, you should accept it by clicking on the check mark to the left of the answer. –  dsolimano Apr 29 '10 at 4:49
    
It didn't let me at the time it was answered! Dylan answered my question really quickly. –  teejmya Apr 30 '10 at 3:03
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DDR2 and DDR3 use different timing protocols (and possibly different pin counts, not sure about that). Grab a new stick.

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