MacBook Pro RAM in older MB?

[strausd]

I wasn't sure which thread to post it in so I decided this one because more people are looking at it. So I upgraded the RAM in my 2009 MBP from 4GB to 8GB. It is DDR3 1066 MHz. My brother has an old MacBook with 2 GB of DDR2 667 MHz. Would I be able to put my old 4GB DDR3 in his computer? Would this cause any problems? Would the computer just underclock my RAM to 667 and keep everything working fine?

Thanks!

 

[Eddyisgreat]

DDR2 mem isn't interchangable with DDR3 mem.

So no.

 

[r.j.s]

No. DDR3 and DDR2 are physically different.

 

[strausd]

Dang. Alright, thanks for the replies.

 

[CW Jones]

No they are........ Aw crap someone beat me too it lol

I know 2010 MB and 2009 MBP is interchangeable...