artifacts OCCT Artifacts when testing CPU

[Arwinnd]

Hi, I have this weird problem. When I run OCCT after a while i get visual artifacts. I See like some rectangles with multiple colors and generally f up graphics for few seconds. This shows only in occt linpack. I use it some with avx and some without. Also screen gets black for a few seconds, and everything is after that back to normal, and test runs fine without reported error. I tested with Prime95, RealBench, Intel Burn Test, Unigine Heaven, 3D Mark Time Spy, and no such errors occur. Also my onboard sound chip is getting nuts when I use occt. It continuously alternately notifies my about that my audio device was plugged in and then plugged out, but all of them are plugged in tightly. 

 

My PC: i5 8600K on stock, NZXT Kraken X62 mount front, air take in, MSI Z370 Gaming M5, GSkill TridentZ RGB 3000MHz 16 GB DDR4, MSI GeForce GTX 1080 Ti, Corsair RM750X PSU, Samsung Evo 850 250 GB SSD, 1TB WD Blue, Windows 10 freshly installed, newest bios. 

 

Please help me with that. 

 

Sincerely, 

Adrian