RX 580 4GB is having issues. Anything under power limit/stage 4 gives terrible hashrate and some cards stop mining.
Same problem here, I have 27 RX580 NITRO+ 8G. Undervolt on Linux does not work, either on Ethos or SMOS. I also had to go back to Windows and remove one GPU from each rig to be 8 GPU each rig. All Linux OS, "globalpowertune 4" not work with double mining (card stop) and suck to much power anyway, 5 is beyond too much power.
The whole purpose of having a Linux operating system is to recognize all the GPUs and do the undervolt, but the system can not, so the whole purpose for using Linux ends here.
I work for a company that wanted to buy 100 Ethos licenses or use SMos, was all cancelled to use Windows
I think you can try to write moded undervolted BIOS to cards for Linux ethOS or smOS.
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BTC
You could do this... I prefer realtime undervolting on Linux, however, which *is* in fact possible (NSFW): https://i.imgur.com/1UEGeRz.jpg
Did you do undervolt on bios or on Linux? Can you tell me what parameters you used on the rx580 nitro +? thank you