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I have 4GB of 1067MHz DDR3 RAM, upgrading to 8GB, in my late-2008 Apple MacBook Pro.

Crucial’s scanner says my girlfriend’s slightly older MacBook can support 4GB of 500-something-MHz DDR2 RAM (she has 2GB now).

Is it a really, really terrible idea to put my RAM into her computer?

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(To be clear, I assume it would run at a slower speed, if at all.) –  Alan H. Jan 11 '11 at 1:51

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up vote 4 down vote accepted

Don't do it

DDR3 and DDR2 are not at all compatible. Different number of pins, different technology, completely different. It won't even fit in the slot properly. Bad idea.

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