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bobtomay

 
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Member Since: Dec 22, 2006
Location: Texas, where else?
Posts: 25,002
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Mac Specs: 15" MBP 2.33 C2D 256 4GB, MBA 13" i7 1.8, MB 2.0 2GB, Nano 4th, 3GS, iPad 1

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Just to clarify and you really should know what you are doing in this case:

Your system board has a dual channel memory controller. In order for dual channel to achieve it's fastest operation, you need matched pairs of memory. For just a little understanding of dual channel see this.

With unmatched pairs, you will essentially be running in single channel operation. You'll have use of the additional memory, but at a slower than optimum speed.

Is that bad? Not as "bad" as it use to be and you may or may not notice the difference. At the price of RAM today though, I always recommend matched pairs. I even have a matched pair in my old '06 MBP with 2 x 2GB in order to maintain dual channel speed, even though that system is hardware limited to being able to use only 3 GB.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.
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