Usable RAM versus maximum RAM?

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has heard usable ram versus maximum expandable. have mbp 2.2ghz w/ 2 x 1gb ram currently.

told me if replaced both simms 2gb cards, computer use 3gb total. true?
 

hi welcome mr

search function of site useful first stop, have covered numerous times.

coreduo machines can accept 2 gb ram (2 x 1 gb sodimms)

core2duo machines can accept 3 gb ( 1 x 1 gb + 1 x 2 gb) or 4 gb ( 2 x 2 gb sodimms) in case cannot utilize more 3.3 gb ram due limitation in hardware memory controller - every other windows core2duo laptop.

core2duo santa rosa machines (as of today, macbook pro 2.2 , 2.4 ghz in apple line) can install , use 4 gb total ram (2 x 2 gb) because chipset has newer memory controller.
 


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