Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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Do I need two ram chips?

When ordering RAM do I need to buy two?

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No. Although it will run better with matching pairs due to interleaving, you can upgrade just one chip.(a 4 or an 8 GB)

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 as first confirmed by OWC, this model actually is capable of using up to 16 GB of RAM with two 8 GB memory modules. Here's how to install it: MacBook Pro 15" Unibody Early 2011 RAM Replacement

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