Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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number of ram slots

how many memory slots does the 21" iMac have? Does it support 16gb in 2x8gb or 4x4gb?

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Apple is showing the maximum RAM as 8GB 1333MHz DDR3 SDRAM 2x4GB

So it appears it has two slots

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it appears the maximum pre-configured amount is 8gb but the manual says it has 4 slots. what is not clear is if only the 27" model has 4 slots or if both do

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What manual? Can you give a url?

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There are four, so 4 x 4 GB. I edited the teardown this morning to reflect this fact. The box of the iMac lists the maximum RAM capacity as 16 GB.

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How do I know which RAM slots of the four are already in use? My computer has 2-2gb of RAM. I want to leave those two in and add 2-4gb

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Diego Silva will be eternally grateful.
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