Model A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3 or 3.6 GHz Core i5 Processor

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Ram Slot allocation for iMac 2010

How do I find the number 1 slot for an additional RAM module in a mid 2010 21.5" iMac.

The basic machine has two 2GB modules installed in the upper slots. I would like to take advantage of the slight increase in performance one gets when a single 4GB card is correctly installed in the number 1 slot however I am unable to determine which is the number 1 slot.

Currently the memory slots shown in 'About this Mac' are, top to bottom: empty, 2 GB, 2GB, 4 GB. I believe they should be 4 GB, 2GB, 2GB, empty?

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Lets see if we can clear a few things up here.

Memory upgraded in matched pairs is ideal. While you can use mixed modules (size wise) I don't recommend using the same size from two different specs. Here is a good reference while it is on the older G5 series iMac it still applies today! Benefit of using matching memory modules (RAM). Remember your system has a 64/128-bit memory bus. I would recommend you get a second 4GB module if you really want the benefit of faster access.

Banks 0 & 1 & Odd/Even modules:

When you place modules you want to have the bank Top & Bottom (Bank0 & Bank1) have the same modules within the two slots each bank has, Left & Right (Odd & Even).

Here is the Apple instruction sheet for installing memory, you'll need to jump down to the diagram to get a better idea what I'm speaking about: iMac: How to remove or install memory.

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Thanks. This now makes sense to me. I will order another 4GB card.

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Bill Hegel will be eternally grateful.
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