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We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
I HAVE install 4 number 8 g ram cards in my IMac27 when I first bought the computer but now feel its time to up grade again. What I need to know is what is the largest ram card I can install in this machine and what make/type of memory card do I need.
Windows, Windows 6
Apple's specs say 64GB, but the 2019 27" iMac can acctually accommodate up to 128GB.
You can find RAM upgrade options here at macsales.com.
Most veterans here will recommend that you purchase your RAM only from OWC/macsales (linked above) or from Crucial. The Mac can be very picky about the quality of the RAM that you install, so keep that in mind. Stay away from the cheap stuff.
Apple's specs say 64GB, but the 2019 27" iMac can acctually accommodate up to 128GB.
You can find RAM upgrade options here at macsales.com.
Most veterans here will recommend that you purchase your RAM only from OWC/macsales (linked above) or from Crucial. The Mac can be very picky about the quality of the RAM that you install, so keep that in mind. Stay away from the cheap stuff.
... but now feel its time to up grade again.
Don't feel. Evaluate, quantify, measure.
If your Mac's performance is not being constrained by memory limitations then installing more would be a waste of money.
It's very easy to determine if your Mac's performance is being limited by available memory. Please read Check if your Mac needs more RAM in Activity Monitor - Apple Support. If the "Memory Pressure" graph is frequently "red" your Mac would benefit from additional memory. If not, it won't. It's that simple.
What year iMac?
The earliest 27" iMac - 2009 - would top out at 32GB RAM.
The newest - 2020 - can accommodate up to 128GB.
The iMac (Retina 5K, 27-inch, 2017) (Not sure if that is your one) can go to 64GB - double the 4 x 8 = 32GB you currently have.
Click here for information. Apple's specifications only reflect modules available when a given model came out; larger ones which otherwise meet the posted requirements will likely work.
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K 27" iMac dates from 2019. It currently has 8GB installed with Two 4GB memory modules. What can this model accept at Maximum?
WHAT IS THE HIGEST MEMORY I CAN INSTALL IN MY IMAC 27
