Bitcoin Forum

Hello all,
I manage to build a 13 Rx 570 GPUs mining rig with Asrock H110 Pro BTC. When I probe the AC output with multi meter during ethereum mining operation, it consumes around 1,980 more or less watt of power. The GPUs themselves are consuming around 1,300 watt, but the rest like CPU and PCI risers are consuming 680 watt of power. Does this sound right? Or is there any other way to suppress the consumption?

regards

If you do a proper undervolt to around 0.850-0.95V or so you should use like 120Watts per GPU.

So yours is a little high  most likely because you are running on stock voltage which is 1.10-1.25Volts basically a waste of power.

The PCIe riser will usually use 40-50Watts or so. Most of that power is delivered to the memory of your GPUs. Your CPU and SSD and Memory provably only console about 30-40 Watts max.

Your power consumption indeed looks a bit high for those GPUs. Like adaseb said, you are probably using stock clocks and stock voltage. When you really wanna change those, you have to fiddle around with flashing and MSI AfterBurner :)

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

Are you sure that each PCIE riser will use 40-50 Watt?

Send me your rom and i will get your cards a lot lower!

here is my 12 card rig with 470's:

https://i.imgur.com/DtgUnI9.png

@coyn,
here are my VROMs, there are 4 chip sets in my Google drive:


https://drive.google.com/drive/folders/1GZvCj2ANdoF15-o44151ozXJF5K1SGWG?usp=sharing (https://drive.google.com/drive/folders/1GZvCj2ANdoF15-o44151ozXJF5K1SGWG?usp=sharing)

How exactly are you measuring the input power with your multi-meter? Do you know what power factor is? The power monitor functions for GPUs is notoriously inaccurate. What is the efficiency of your PC PSU?
All these things make accurate accounting for power difficult. No way are your CPU and risers and other system components using 680W.

Baz

Here u go:

https://ufile.io/3shxf

Test it out. Mem is on 2050 (can increase to 2150 manually) voltage is 925 (can decrease to sub 900) manually.
Let the CORE STATE on 7!


Let me know!

@coyn,
this is very good, the power draw reduces dramatically, could you do it with other 3? There are 4 different kinds of chipset.

Best regards

Yes ofcourse, what are the results?

that chipset setting I only manage to get it around 82watt power draw, with your chipset it only draws 72 watt. So it's very good.

That's a good point. When you mentioned power factor, I just realized that when I read the power, I activated all machines, which drew interference. After I turned off most machines and left only 1 to be read, the reading said it was around 1760 instead of 1980. I use 80plus gold PSUs by the way.

If you mining eth that's going to use way more power than monero :)

When you compare the power draw , you also should compare the hashing speed at the same time, :) on the long run at the pools side, and check for memory errors.
Your gpu might using less power, your hashing speed can be the same or lower, but if you have a lot of memory error, your pool side reported hashrate going to be much lower that your miner software telling you :)

Buy a wattmeter, then you will have accurate data

Consumption 1980 watts

For example, the efficiency of the power supply unit is 90%, hence the farm consumes 1800 watts

1800 watts -100 watts (consumes CPU, MB, HDD ...) ( I did not take into account the additional cooling)
1700/13 = 130 watts consumption of each card.

this is the usual power consumption of these graphics cards without a downvolt.

using a BIOS modification or a WattTool program, you can reduce the consumption of a each card to 100 watts (90-110 watts depending on the model)

Wattmeter gives the power consumption of a GPu mining computer and not the multimeter, the multimeter is the technician stethoscope to fix a lot of computer problems. The consumption of 130 watt is normal for cards that are undervolted.

Since you are using Linux, use a Linux tool to lower the core clock with that tool in order to improve power consumption. And since you are mining ethereum lowering core clock will not impact your hash rate.

I think you are using the wrong word when you say multimeter, you can measure the power with one but you  have to make two measurements, the voltage and then the current and then multiply them together to get power in watts.
Are you using a meter that plugs into a wall socket and then you plug the lead for the mining rig into the meter? Thats a wattmeter, or Killawatt.
The efficiency of the psu is significant. With a 80% psu there is a 20% difference from input to output. So adding up the gpus and cpu and other system power will always be 20% lower than the power measured on the mains input. If all the gpus and stuff added up to say 1000 watts, the input power would read as 1200, 20% higher.

Baz

Hi, thanks everyone for the advice and help. It really helps me to solve the problem. I finish optimizing all the GPU cards and measure their power draw. Per machine, which has 13 GPUs with 80% PSU efficiency, it draws around 1780 Watt, which is not too shabby. I use multimeter to measure the current and multiple it by volt. Again, I appreciate with the help, thank you all.

"it draws around 1780 Watt" why so much? I think you can get it a little lower :)

My multi meter reads 8.1 ampere when I tap its output current, so when I multiply by the 220 V voltage, I get 1782 Watt. However, the result is distorted by the electrical magnetic noise around the probe, which is located in the output of voltage regulator. There is a reading discrepancy between probing with 1 machine running and multiple machines with 1 ampere difference or 220 Watt, whereas the lone running machine reads smaller power draw compare to run with multi ones, hence I conclude that the result is distorted by noise.

So assume 1782 watt without distortion is resulting 1782 watt - 220 watt = 1562 watt. Suppose there is 20% power waste with 80% PSU efficiency, the machine power draw without the waste would be 1562 watt / 1.2 = around 1301 watt that makes around 100 watt per GPU, which is ok.

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.

you cant undervolt in ubuntu