AMD Power for a Gigabyte X399 board
AMD Power for a Gigabyte X399 board
You can operate it perfectly using only the 8PIN. I do the same with a 1950X on an Asrock X399M. There are also solid overclock options for just the 8PIN.
Thanks a lot for the extra overclocking margin—it would make a big difference with liquid cooling.
I need to consider which PSU will best support all the overclocking features you want to use.