This is an important discovery. The defaut settings from HP if you see this BIOS feature is for all the PCI and PCIe slots is to have that top option set to Enable and the bottom one set to Disable. This thread continues on the following post, with added important information:
Look HERE.
Whatever you do, don't change your video card to a "Compute" device by changing its slot's Compute BIOS option to Enable. If you do that it is then not a video card and you'll not be able to see what you need to in order to get things back to normal. That is explained in the link.......
