Gaming on DDR4 Memory: 2133 vs 2666 & 3200MHz, 8GB vs 16GB
OLOy DDR4 RAM 32GB (1x32GB) 2666 MHz CL19 1.2V 260-Pin Laptop Gaming SODIMM Upgrade for 2019 iMac 27-inch with Retina 5K Display, Late 2018 Mac Mini (MD4S322619MZSC) at Amazon.com
How fast is 2666MHz compared to 2400MHz DDR4 RAM? - Quora