Are you using overclock on the memory?
yes, I do.
core 100 and memory 800 power limit 70, but I have MCU load at 60% dunno if should be 100%
What brand and type of GPU are you using.
I'm using a EVGA 1070 SC. But with 600 mhz plus on the memory I got artifacts.
It has Micron chips on it.
My 1060 cards with Samsung memory work flawless with +850 memory, and those without not more than +600 stable.