Please remember this, when you get your PC back:
When you get it back, try if the 32 bit exe still runs fine compared to the 64 bit exe. It's really weird thing and if there would be a hardware problem, it would show with both.
If the 32 bit exe still runs better, it's a software issue!
Now they changed my board to a Asus Rog Strix Z 390 E gaming, and put a new processor , same model i9 9900K, the problems persist.
I am tweaking with Nvidia control panel, trying to perceive what are the best options there .
Until now, I can put it better tweaking there, but micro stuttering stills present.
I choose on the BIOS to put computer with memory XMP II profile and overclocked at 4.9 GHz. I don’t touch on voltages or energy options there. All automatic way.
I ll go to install new windows version 1903 from root and all the Asus controllers, then I ll go to install Nvidia Experience and last drivers and see joy it goes !
From hardware who eventually causes this issues it only can be:
Graphic card
Memory ( I had tested it during 2 hours with no errors with memtest86, with no issues)
Power supply ( Corsair RM750, already with 5 years)
Maybe this could de a software problem, but I installed everything, from different windows 10 versions to a serie of different Nvidia drivers and the problem persists).
Tomorrow a friend of me, will bring me his computer, we will go to swap graphic cards to see if it solve the problem and if my graphic card on his computer causes the same issues, he have a GTX 1070 or GTX 1070TI, I can’t remember).
I ll go to install Assetto Corsa on his computer first, to see how it goes there .
Thanks