There are basically no tools available for Linux, to mess up with voltage. Even Claymore's options doesn't work on Linux with a note, that the only way to lower power consumption is to modify the card's bios.
I am having a hard time to actually modify the Bios in order to drop the voltage. I've been Googling on how to use the PBE (Polaris Bios Editor) to achieve that, but I failed to fined any significant information. I tried different forks of the tool, but with little to no success. The direct voltage numbers in PBE doesn't seem to change anything. Someone wrote on BTC forum, that the only way to alter voltage is to edit the Hex Straps, but I have no idea on how to do this.
Any of you have any advice how to lower the voltage permanently? I had really hard time getting the Rig working under Windows, but it's very stable on Linux with 6 GPUS. The only problem is that the rig consumes 1300W, which turns into significant electricity bill. I have 7th-card waiting, but the Rig has only 2x750W PDU, so I cannot attach another card until the power consumption drops. Currently my cards eat around 200W. Playing with MSI Afterburner / Trixx and other tools I managed to get the that value to 120W without dropping hashrate. I read that some people get even under 100W with RX 850.
Any tips and pointers really appreciated.
ps. How is the situation with NVidia cards under Linux? Is it also that hard to underlock the voltage?