Overclocking in linux

[seropeo]

Hello,

I have a pc with 2 Sapphire Nitro+ RX-580 4Gb. I have managed to overclock them to 29MH by editing the straps in the BIOS and passing overclock/undervolt options to claymore, but I can only do this on Windows. When I go to linux to try they behave like stock cards. Claymore params does not seem to affect them.  Any help to make this config work on linux is appreciated.

Best Regards,

IA