Ethereum Mining Power Consumption with 13 GPUs

[Piskeante]

you should also consider heat in the room.

At 25ºC my PSU uses less power to power the rigs. for example, i have one corsair HX 1200i that uses 900W from the wall to power a 6 gpu rig pulling 189,8 mh/s. it can go down by reducing core clock below actual 1240mhz. But i would also lose performance.  when ambient temp is around 35ºC (i live by the sea and it's very hot on summer) my PSU needs around 935W from the wall to power the rig.

Today, at current prices,  it makes sense to tweak gpus to use less power, even getting lower hashrate. BTW, my cards use from 837mv for an RX 570 to 956mv for a very low ASIC RX 580. the rest in the middle are around 850-868mv.

[wtfonly16]

I'm using Linux ubuntu and PolarisBiosEditor to edit GPU ROM, so I use the term underwatt instead of undervolt since it only allows me to tune the power parameters like TDP and Max Power Limit. When I run the miner and read the watt output of each GPU using software read using "watch cat /sys/kernel/debug/dri/0/amdgpu_pm_info", they range around 80Watt to 110 Watt consumption depending on the GPU chip set. But when I read the power consumption via multi-meter, it reads around 1,980 watt.

I underwatt some of the GPUs, some of them I can't for some reason. So either my reading (multimeter or software) is wrong or my setting is. Is there any way that I have reconfiguration on the motherboard side that causing the overdrawn power consumption? Anyone is using Ubuntu or Linux?

regards

you cant undervolt in ubuntu