I should have also mentioned DaVinci also heavily uses CUDA on Windows, and metal on Mac. I'm assuming the functions implemented in these frameworks do have fallbacks on Vulkan or similar, but I doubt they're as optimised. I know there are some issues with Resolve on Linux for example. Any halfway decent Nvidia card with enough VRAM should work fine - i.e.: a 30 series card is grand. But I'd be skeptical integrated graphics would have the horsepower for denoising or a host of other build in effects. Rendering would likely be slow also. Although this is the least important element of the process on modern hardware.