I have a 1660 super. I've tried this in multiple computers so I know it's the card.
It boots fine. It will either make it to the Windows login screen and by that time it shuts the PC down. If you go directly into the bios the same thing happens. Id say about 15 seconds is all I get.
I don't think it has time to overheat. Is there any tricks I can try? Anything I can look for on the board?