Question about G.Skill Ripjaws

Hello,

This RAM module meets the requirements for the iMac (Retina 5K, 27-inch, 2020):
https://support.apple.com/en-us...
PC4-21333
Unbuffered
Nonparity
260-pin
2666MHz DDR4 SDRAM

Therefore it should be compatible with your computer

With kind regards