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I've found a similar question but it's about the 2016 iMac, so I want to double check for the current (2019) model.

Can I mix new RAM (Crucial CT2K16G4SFD8266) with Apple's stock RAM? I am planning to buy an additional 32GB of memory, so it'd be a total of 40GB - is that even a number the 6 core iMac can handle?

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Yes, you can mix them. There are 4 slots, so you can keep the Apple RAM, even if it's in 2 slots.

According to the reliable EveryMac, your Mac can take up to 128Gb !!

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    I totally endorse this. More ram is always better than less ram. The system will beep or not run when the memory isn't compatible. – bmike Jun 29 at 14:19
  • Just in case someone stumbles upon this: I've done the upgrade with the mentioned RAM and the iMac runs fine with 40gb of memory. – Philip Feldmann Jul 1 at 16:10

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