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Original post by: Dan ,

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The problems most people have is not using the correct RAM. Unlike a Windows system which allows you to dicker with the BIOS settings, Mac’s don’t have these tweaks available. So you really don’t want to use too high a spec’ed RAM SODIMM or of course use too slow as well.

You need 1867 MHz PC3-14900 DDR3 SDRAM SO-DIMMs (204-pin)

Buy from a name brand web site or large store like MicroCenter or BestBuy or even iFIXIT so you don’t get seconds or fake units and have a company that will support their product.

As far as which slots to use if you are just adding then just use the empty slots.

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