We are building a mining rig for a customer and it WILL not consistently work with more than one GPU. Most of the time it will not even post and on the occasion that it does and windows recognizes the GPUs it won't use more than one. We have tried both drivers. I have above 4G on and I have disabled the integrated audio, the system is in UEFI mode as well but it doesn't seem to make a difference.
Specs of the rig
MSI X570 Gaming Plus (best board we could source I know its not ideal)
16GB DDR4 3000 Mhz
AMD Ryzen 5600G
500GB Sata SSD
1X 1000 EVGA Supernova
2X 3070 Ti
6 X Noctua NF-P12 fans