Dude if your Mac is genuinely NOT Core 2 Duo it will not take 3 gb RAM.
The max that a non-core 2 duo will take is 2GB (2 x 1gb)
CHECK:
http://www.macupgrades.co.uk/store/m...me=macbook-pro
Only the next revision Core2Duo 2.16 will take 3gb (i have one).
You can put 4 gig in 2 x 1gb slots but the laptop will not use the extra RAM and its not a good idea. People do this because the are told not to put unequal RAM in (ie: 2gb & 1gb). I have unequal RAM in my old MBP it works just dandy (not an ideal situation but better than going over).
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