Max GPU Memory Clock on Idle Desktop on 144Hz

Hi. I have RX580 8GB and Viewsonic VX2458-c-mhd 144hz 1080p monitor. Using DP 1.2 as connection cable. As I mentioned in the thread subject my graphics card stays at the max memory clock on the desktop. This is causing more power draw and more heat for sure. I tried to change my resolution settings to LCD standart in the CRU utility and actually it worked. It fixed my max gpu memory clock problem. But when I do that there was some flickerings on the screen. It is hard to describe exactly. It was looking like some random images popping up on the screen and disappearing immediately. And this was really eye hurting. I also tried other options in the cru utulity (like LCD native, LCD reduced etc.) but none of them worked for me. I added my default values as attachment. So I mean what is causing that random image flickering? Any help would be appreciated..

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