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Quote from: whatomine on September 24, 2017, 03:55:39 PM

Can anyone comment on the power consumption for the RX580 cards. I have two rigs each has 6 RX580 and both are dual mining ETH+LBC (Eth: 176 Mh/s + LBC: 510 Mh/s). Each rig consumes about 1020 Watts reading from the wall-meter while GPU-Z reads less than 130 Watts for each card. I think they should all be around 6*130 + 70(system) ~ 850 Watts total. My setting (-cclock 1150 + -mclock 2100 -cvddc 870 -mvddc 870)

The power usage shown in GPU-Z is for the card VGA power connectors. You also need to add 40-50W for each riser. 1000-1100 W is about right for a six card RX 580 rig when dual mining.

The risers themselves do NOT use anywhere close to even 40W. The power load for risers is negligible even with six of them. It's the GPUs themselves that are using the power.

I don't think the power sensors in GPUs are all that accurate anyway plus they fluctuate so wildly.

I have switched all my RX BIOSes to Anorak's powersave versions. I lose about 3-5% hash rate but it saves almost that much in power and reduces heat output and wear on the cards.

When I see 6 GPUs consuming over 1000W and then I look at an Antminer that can produce 4x more revenue on 1200W I wonder why I'm even bothering with GPUs...

You are wrong. powered risers use between 40W - 50 W each, which is NOT reported in GPU-Z. This is easy to verify in a dual PSU setup like I have where all the risers are connected to the same PSU as the motherboard and the secondary PSU only powers the tops of the cards.

The risers don't use energy itself. it just feed the GPU just like a PCI-E slot. Memory energy consumption is missing on GPU-z that is why is higher on the wall.

I think the power consumption drawn from the PCIE slot is missing from the GPUZ.

GPU-Z only shows the actual power draw of the GPU core. There is some lost in VRMs, memory system, PCIE interface, fans, and system PSU. At the wall is around 60w higher than what is shown in GPU-Z, with a 80+ Plat PSU.