You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

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

Reply
Question marked as Top-ranking reply

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.

3 replies
Question marked as Top-ranking reply

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.

Additional RAM for iMac 27 (2019)?

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.