I came along this topic at
macrumors.
Read the part RX VEGA Bios compatibility. "The standard card can be safely flashed with either another standard BIOS or a nano BIOS." Standard (full size) PCB: Sapphire Nitro+ RX Vega 56 & 64, The following cards are known to readily accept a different BIOS: no Sapphire Nitro+
I think to try it, switch to 2nd bios, dump that bios, and replace it with a reference bios. If it don't do anything I will flash it back with dumped bios. Maybe my current bios is different or newer nitro+ bios.
According to Macrumors: VEGA HIGH FAN Speed issue:
Issue not present for Sapphire Nitro+ RX Vega 64 (model 11275-03)
My issue is only that it spins up to 100% after leaving a 3D application. Under normal circumstances the card is OK. I need this to be fixed otherwise I will return the card.
For now I have to find out why my windows is gone. I had it on a NVME but sometimes the UEFI boot options disappear for a reason I don't know.