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Additional RAM for iMac 27 (2019)?

I am finally ready to upgrade my RAM on the iMac (27" 2019) and from what I read at the Apple support pages and online, I need 2666Mhz DDR4 modules, but when I do the "About this Mac" my comuter says 2667mhz. Is that a typo?!? No where can I find a webpage that agrees with that.


Thanks for your advice.

  • PJ

Posted on Oct 2, 2020 12:59 AM

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Posted on Oct 2, 2020 1:15 AM

An artifact of display rounding, versus display truncation.

The underlying 2666.6666666666666666666666.... MHz rating rounds to 2667, and truncates to 2666.

2666, 2666.6..., 2666 and 2/3, 2667? Same stuff.

That’ll will work / is the same.


As otherwise written, there are four slots for 260-pin PC4-21333 (2666 MHz) DDR4 SO-DIMM memory.

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Oct 2, 2020 1:15 AM in response to Patrick Judge1

An artifact of display rounding, versus display truncation.

The underlying 2666.6666666666666666666666.... MHz rating rounds to 2667, and truncates to 2666.

2666, 2666.6..., 2666 and 2/3, 2667? Same stuff.

That’ll will work / is the same.


As otherwise written, there are four slots for 260-pin PC4-21333 (2666 MHz) DDR4 SO-DIMM memory.

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Additional RAM for iMac 27 (2019)?

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