The quickest way to make your MacBook run faster is to add more RAM. Whether you own a MacBook Air, a 13" MacBook or a MacBook Pro 15" or 17", adding memory will make your machine run better. The Mac OS works best with plenty of RAM and as mainstream software applications get bigger and more complex, the more memory they need.
Fortunately, the price of RAM has dropped in the last few years and upgrading memory is not the mortgage-extending exercise it once was. Now there's no excuse for having too little RAM.
The MacBook Air takes 2 x 1 GB to a max of 2 GB.
Early 13" MacBook models could only support 2 GB of memory but late-2006 MacBooks could address 3GB if 2 x 2GB modules were installed (although Apple specs said not) and late-2007 MacBooks can address the full 4GB.
Early MacBook Pro 15"s and 17"s were maxed out at 2 GB but the first Core 2 Duo models could address 3 GB if 2 x 2GB modules were installed and the mid/late 2007 models can address the full 4GB.
If you're unsure which model MacBook you have, check with Apple.
Here's a selection of MacBook 2 GB memory modules in a range of prices:
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US $68.52
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US $64.67
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US $42.90
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US $39.99
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US $119.19
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US $119.19
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US $126.89
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US $119.19
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US $57.40
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Tags: black, combo, macbook, MacBook Air, macbook pro, MacBook pro 15, memory, RAM
...how it works and
NEW Apple MacBook Pro 15-inch LED Part No. MC371LL/A

2GB RAM MEMORY UPGRADE FOR APPLE MACBOOK MA254LL/A
2GB 2GIG RAM MEMORY UPGRADE APPLE MACBOOK PRO MB990B/A
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2GB Kit Memory RAM Apple MacBook Core 2 Duo 1.83GHz (13