MacBook RAM question

Rasmall · Rasmall #1 (**permalink**)

04-06-2012, 06:48 AM

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.
TIA

wolfpuppies3 · wolfpuppies3 #2 (**permalink**)

04-06-2012, 09:29 AM

I would not expect to see any performance improvement after going from 3GB to 3GB. 3 is all the machine will address.

Rasmall · Rasmall #3 (**permalink**)

04-06-2012, 09:37 AM

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:-)

Rasmall · Rasmall #4 (**permalink**)

04-10-2012, 10:04 AM

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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Rasmall #1 (permalink)
Member Since: Dec 14, 2011 Posts: 7	04-06-2012, 06:48 AM 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. TIA
	QUOTE Thanks

wolfpuppies3 #2 (permalink)
Member Since: Oct 07, 2010 Location: Virginia, USA Posts: 381 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	04-06-2012, 09:29 AM I would not expect to see any performance improvement after going from 3GB to 3GB. 3 is all the machine will address.
	QUOTE Thanks

Rasmall #4 (permalink)
Member Since: Dec 14, 2011 Posts: 7	04-10-2012, 10:04 AM 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.
	QUOTE Thanks

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