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I have 1GB RAM in my MacBook Pro 2.16GHz Core Duo 17", model number A1151.

I have one empty slot to insert 1 GB RAM. What type of memory do I need to buy?

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Www.crucial.com have an excellent system to find this out –  Shutupsquare Sep 12 '11 at 19:54

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In order to find out what type of meory you need, you should check out Apple's own support site:

MacBook Pro: How to remove or install memory

You can then use the links at the top to find out more about your model (i.e. Late-2008 and earlier).

EveryMac.com also has a page for … well, every Mac, which then lists the type of memory used. You'll find it in the specification table. For your machine, this would be here.

They also have a FAQ site dedicated for the pre-unibody MacBook Pros:

How do you upgrade the RAM in the MacBook Pro? How much RAM of what type does it support?

Note that your MacBook "officially supports up to 3 GB with a 2 GB SO-DIMM in one slot and a 1 GB SO-DIMM in the other".

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