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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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New memory from fixit not detected

After working from home for a few months and seeing my late 2015 iMac (17,1) struggle a little bit I began looking into upgrading the memory. Apple’s website says the max capacity is 32gb, but I see ifixit, owc, and a couple other places showing that 64gb is possible as well, using 4 x PC3-14900 16 GB RAM chips. I purchased this memory here at ifixit and when I tried to upgrade to it the memory is not detected.

I have tried all four sticks of memory I purchased in different combinations of slots, but the only memory that shows up when I go into About This Mac are the OEM sticks that came with the iMac. If I only have the new memory in the computer it doesn’t turn on at all. I get a single beep once every five seconds, which the apple support article says means “no ram is installed.”

Is this just incompatible ram, even though it’s being sold as compatible, or might I have another issue I need to address to make the ram work?

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Are you sure you have the correct model?

The Mid 2015 27” iMac uses 1600 MHz PC3-12800 DDR3 and won’t work with the Late 2015 1867 MHz PC3-14900 DDR3 SO-DIMM’s.

You’ll need to contact the iFixit store folks to exchange out the RAM if thats the case.

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I have verified in the System Report that my model identifier for my iMac is 17,1 (EMC-2834) and it also says my current memory is 1867 MHz DDR3.

I have also gone through the compatibility check on iFixit multiple times to make sure I choose the right thing. In addition I did a compatibly check again on OWC as well. They both list 1867 MHz PC3-14900 DDR3 as compatible.

Looking up my iMac on everymac.com seems to confirm this as well. (https://everymac.com/systems/apple/imac/...)

Aside from the fact that it does not in fact work, all signs seem to point to the fact that it should. I just can’t imagine that I got four faulty sticks at the same time, and four replacements might work fine.

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OK thats good!

So we are sure we have the correct RAM.

Put the new RAM in, restart the system and let it sit! Give it 20 mins. so the system has enough time to register the new RAM.

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Jacob Desaulniers 将永远感激不已
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