upgrade RAM in both slots required?
Do I have to upgrade the RAM in both slots of my mid-2012 13" MacBook Pro to the same capacity, or can I have a lower capacity (original 2GB or 4GB) chip in slot 1 and a higher capacity (8GB) chip in slot 2?
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You can have different amounts of RAM per slot. It is gernerally advised to keep the ram the same, but it is not a requirement.
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You can mix then as long as they are the same speed. You loose interleaving but the RAM increase more than makes up for it.
RAM Type: PC3-12800 DDR3L Min. RAM Speed: 1600 MHz
Details: Supports 1600 MHz PC3-12800 DDR3L SDRAM SO-DIMMs (204-pin).
Standard RAM: 4 GB Maximum RAM: 16 GB*
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