RAM Upgrade help

I also recommend that you avoid using a third party to purchase the RAM. Go directly to the previously linked sites. I am not sure of what "single rank and dualrank" means, but those two sources will define exactly what you need for your computer.

For example, if your iMac 27 2017 is correct, OWC Memory Upgrades For 27" iMac with Retina 5K Display (2017) describes the compatible RAM.

macjack wrote:

Here's a very technical answer. I never ran into those terms myself:

https://www.crucial.com/support/articles-faq-memory/what-is-a-memory-rank

Thanks for that. Very technical indeed! Your link also pointed to this link which describes "Ranking" in terms that I can almost understand. 🤓

I have used and am completely satisfied with Macsales, but there are others who will also recommend Crucial.

IMHO these are the only two sources you should consider using.

Here's a very technical answer. I never ran into those terms myself:

https://www.crucial.com/support/articles-faq-memory/what-is-a-memory-rank

You are welcome.