Run the script you can find in the first article to display your iommu groupings. You should be able to see how things are laid out.Yeah, the reason I asked is because I had throught that in order to conserve PCIe lanes, that some designs essentially share the PCIe lanes between the iGPU and the x16 slot, so when you use the PCIe lanes for a discrete GPU it deactivates the lanes going to the iGPU... But maybe that is an AMD thing.
As I said, I haven't spent much time with Intel systems since my x79 build.