Do I need two ram chips?
When ordering RAM do I need to buy two?
Is this a good question?
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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