Speed: DDR4 2666 / 2667 MHz ( PC4-21300 / PC4-2666V ). Compatible with the Apple Mac Systems 2020 Mac mini (non M1) - Model ID: Macmini8,1. 2018 Mac mini - Model ID: Macmini8,1. Compatible with Mac mini 2018 & 2020 (non M1 models) - Model ID: Macmini8,1 - 3.6GHz 4-Core i3, 3.0GHz 6-Core i5, 3.2GHz 6-Core i7.