RDIMM 128 GB of memory can produce approx. 10K MIPS and as a result your system gets more room to run complex apps. DDR4-2666/PC4-21300 operates at an effective bus speed with minimal power consumption and as a result you get optimal computer performance with an improved memory heat dissipation No matter how heavy and numerous the applications that you are using 2666 MHz memory speed will run them smoothly...