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Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

MacBook RAM question

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Member Since: Dec 14, 2011
Posts: 7
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I have a 2007 white Macbook that runs at a max RAM of 3 GB at 667.
Until recently I had 1GB at 667 and 2 GB at 800.
System profile showed 3 GB at 667.
I have now installed two new 667 2 GB sims and system profile shows 4GB but uses 3 GB. To be honest I am not sure if the Macbook runs any better than before.
I ran some memtests on the the new setup and there were some mismatching errors.
Any advice much appreciated.
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Member Since: Oct 07, 2010
Location: Virginia, USA
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Mac Specs: 15" MB Pro, 2.66 i7 ; 11 MBA 1.8GZ i7; 13"MBA 2GZ i7 8 GB mem 512GB SSD, 2 iPad3s, 1 iPad Mini

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I would not expect to see any performance improvement after going from 3GB to 3GB. 3 is all the machine will address.
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Member Since: Dec 14, 2011
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I believe two matched pairs of sims running at the correct speed of 667 even if only using 3+ of the 4 GB available would theoretically swap data and run better than mis matched sims ie. 1GB & 2 GB at 667 & 800....
Perhaps I just wasted my money:-)
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Member Since: Dec 14, 2011
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I have now ran various memtest and benchmark programs using different RAM configurations and my MacBook performs noticeably better with a matched pair or DDR2 2GB 667. No question about it.
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