The Black edition uses Intel Iris Xe Max graphics chip, not Nvidia. Dell replied in PM and said no - don't use the Intel version. Maybe I'll get brave one day and re-enable the graphics chip to see if the BSOD issue has been fixed yet since the BIOS has been updated several times and the graphics driver once since then. Thanks for the quick replies.
I have the Black edition with the separate graphics chip.  I have had to disable the separate graphics chip to avoid BSOD happening several times a day since new and only using the CPU built-in graphics. Dell driver manager says everything up to date.  Just installed latest BIOS a few days ago. Intel driver manager says there is another graphics update available but it might overwrite Dell specific graphics driver.  Should this be installed or not?   Installing this graphics driver from Intel may remove customizations from your computer manufacturer (OEM). If a newer graphics driver is available from Dell, we recommend you install that driver instead. To learn more about installing an Intel driver on your OEM system, refer to this article. If you encounter any issues with the Intel driver, please report them to us.
Inspiron 7506 2-in-1 Dell or Intel Video Driver updates?