Re: MSI GeForce RTX 3060 Gaming X 12Gb runs at 25MH/s !? (not LHR)
I think 3060s are the most problematic series in this generation 
If your cards are not LHR, there 3 things to look:
1 - Drivers
2 - PCI-e 8x
3 - Monitor plug
1 - As Williamm07 said, try driver 470.05
2 - Try to connect one card directly to motherboard, some people related 3060s didn't work well with less than PCI-e 8x speed
3 - Try to connect cards in a monitor, or a dummy plug, maybe the card needs to be connected to achieve maximum hashrate
These 2 videos are good to start:
https://www.youtube.com/watch?v=yE2Kmb3ZHEQ
https://www.youtube.com/watch?v=uDiEOscA2vw
Ok thank you very much for the answer, the cards are connected on a x16 port, directly on the motherboard (AsRock BTC+ H510), do you say that's not good ?If your cards are not LHR, there 3 things to look:
1 - Drivers
2 - PCI-e 8x
3 - Monitor plug
1 - As Williamm07 said, try driver 470.05
2 - Try to connect one card directly to motherboard, some people related 3060s didn't work well with less than PCI-e 8x speed
3 - Try to connect cards in a monitor, or a dummy plug, maybe the card needs to be connected to achieve maximum hashrate
These 2 videos are good to start:
https://www.youtube.com/watch?v=yE2Kmb3ZHEQ
https://www.youtube.com/watch?v=uDiEOscA2vw
Then another question, to update the drivers to version 470.05, is it ok if I take one card at a time, put them on a computer with windows, load the driver and put it back in the rig with another operating system? (SimpleMiningOS)
One card is connected to a monitor, but the other 3 are not. But the hashrate is the same.