Vann I guess there is nothing to do with mod Bios, I just want to run new cards with default Bios and keep them stable.
I did the Bios mod only on cards with Samsung memory and they works stable if I don't mix them with new cards. The biggest issue for me why the rig crashes when there are only new GPUs with default Bios.

I'm reading again your message about "increasing the the power limit to -5%". Should it be -powlim 5 pr -powlim -5?