I hope to use Nvidia integration.
however, if Nvidia Flex and VXGI do not support AMD cards, I can’t use this.
Please let me any information about it 
At least VXGI works on AMD. It’s just faster when paired with hardware optimizations that nvidia has made for voxelisation step.
Hiho ^^
Normaly ATI-Cards can run Nvidia Physiks. Its call Nvidia-Physiks cause its from Nvidia … and dont mean that you need a Card from Nvidia., There are only a few specials wich will need an Nvidia-card (mostly features in Games).
Nvidia Physik is the fastest Engine out there but some options need a 1080 … like the Fallout 4 Godray Patch.
VXGI is nice but, i think, not realy needed.
FLEX is joust super duper awsome and easy to use.
PS: If you going deeper into the "all the ■■■■ for developing, … " Intel and Nvidia is the way to go ^^
Have a nice Day 8)