What is the most efficient tool for stress-testing the onboard video-adapter? I have Intel HD 530, if that matters.
The most reasonable tool I've found for now is Geek3d's FurMark. It does quite good, however!
It doesn't support multi-GPU systems, and I have discrete video too. Which makes it useless, because it tests only my Nvidia card and my problems probably are connected with onboard adapter.
P.S. Yes, I read this question, but it doesn't address my problem fully. It mostly focuses on measurement GPU load, and doesn't touch the point how to achieve this load.