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 ?
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.
So, we can exclude PCI-e speed and monitor plug
Drivers are installed on your OS, not on the card, maybe you're confusing with bios, but you need to install drivers on your operational system
Try windows, you probably have windows installed on your PC, and if you can install 470.05 drivers, you'll find the solution