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Mismatched Memory

I'm looking to purchase a new Macbook Pro and wanted to ask about having mismatched memory.

I feel like 6GB would be plenty for me, so I'd like to shell out for 1 4GB stick to pair with one of the pre-installed 2GB sticks, instead of spending the exorbitant amount for 8GB.

http://eshop.macsales.com/Reviews/MacBook/Testing/Memory_Benchmarks

Generally, the information I've found seems to indicate that more memory is better, in all situations. Also, that matched memory of the same total GB amount is better than mismatched. However, all the information I've found is pre-10.6, and I know a lot of under-the-hood changes were made in Snow Leopard.

So that being said, would I benefit more from my mismatched 6GB than matched 4GB?

Any advice appreciated!

MacbookPro4,1, Mac OS X (10.6.2), 4GB RAM

Posted on Feb 8, 2010 12:29 PM

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Posted on Feb 8, 2010 12:38 PM

The benefits from running dual channel (matched memory) is negligible. You're looking at something like running a mile in 4min 35sec vs. 4min 31sec. While there is "technically" a difference, it is not anything you would ever notice in the real world. The performance increase you get from having more memory far outweighs any tiny hit you'll get by not running in dual channel. Having said that, 4GB is a decent amount of memory. You may not see a big improvement in moving to 6GB unless you are running fairly memory intensive applications. It certainly won't hurt... but you won't see the type of performance bumps that you would see in going from 2GB to 4GB.
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Feb 8, 2010 12:38 PM in response to iRuney

The benefits from running dual channel (matched memory) is negligible. You're looking at something like running a mile in 4min 35sec vs. 4min 31sec. While there is "technically" a difference, it is not anything you would ever notice in the real world. The performance increase you get from having more memory far outweighs any tiny hit you'll get by not running in dual channel. Having said that, 4GB is a decent amount of memory. You may not see a big improvement in moving to 6GB unless you are running fairly memory intensive applications. It certainly won't hurt... but you won't see the type of performance bumps that you would see in going from 2GB to 4GB.

Feb 8, 2010 12:46 PM in response to JoeyR

I frequently run a full suite of apps, including VMWare (Windows 7, Windows XP, alternating), Photoshop and sometimes video encoding.

The reason I'm looking to get more memory is because my "free" memory frequently runs out, and I experience a lot of slowdown while inactive memory is freed and reallocated.

Thanks for the information -- it coincides very closely with what I've read, and I think at this point that I plan to have a 2 and 4GB stick in my new laptop, barring any crazy changes in Apple's new laptops.

Mismatched Memory

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