Hi
After many problems with Illustrator crashing (randomely, any files) and none competent help from adobe I fixed my problem finding a solution here:
https://www.youtube.com/watch?v=hR_IEoJ_zK8
Normally AI sees two card onboard but always choosed to work on integrated one (in my case). There is no option to swich it in AI and none such option in AMD Adrenaline. It has to be done in Windows.
Settings>System>Display>Graphic settings
There You have to choose "desktop app", manually find Adobe programs and set it to high performance.