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Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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What is the correct amount of ram to use?

In my macbook I have 2 x 2gb of ram. I understand I can upgrade to 8gb of ram. I bought 1 x 4gb of ram, can I add this? Or do I need 2 x 2gb of ram instead? basically one 4gb vs. two 2gb.

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You can add just the one 4GB stick (if it's the correct type), to give you 5 GB.

RAM Type: PC3-10600 DDR3 Min. RAM Speed: 1333 MHz

Standard RAM: 4 GB Maximum RAM: 16 GB*

Details: 4 GB of RAM is installed as two 2 GB modules, no slots free.

*Apple officially supports a maximum of 8 GB of RAM, but third-parties have determined that this model actually is capable of using up to 16 GB of RAM with two 8 GB memory modules.

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Thank you. So i have four slots two are filled each with 2gbs leaving me presently with 4gb, so I can add any two correct type of ram in the free slots?

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Your system has only 2 memory sockets. So you'll need to remove your current memory modules exchanging them for larger modules.

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pete will be eternally grateful.
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