Released June 2009 / 2.66, 2.8, or 3.06 GHz Core 2 Duo Processor

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Do I need to add two 4 GB memory cards or one?

My MacBook Pro 15" Unibody Mid 2009 with 3.06 GHz Intel Core 2 Duo has 4 GB of memory. If I want to add another 4 GB of memory, do I need to buy two 4 GB cards so that they are compatible or can I just buy one additional 4 GB card?

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Yes, you can add just one 4 GB stick at a time. This should give you 6 GB.

You do lose a little bit of speed due to lack of interleaving but it's OK.

RAM Type: PC3-8500 DDR3 Min. RAM Speed: 1066 MHz

Standard RAM: 4 GB Maximum RAM: 8 GB

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

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Since you MacBook Pro has two RAM slots you will need to get two RAM sticks. So you will need to buy two 4GB cards to get a total of 8GB or RAM.

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