So 825 h/sec on monero earns about as much as 29 mh/sec on eth, but monero draws 3/4 the power. Monero seems like a no brainer for Polaris.
RX 580 is around 98 watts for 29.5mhs on Ethereum with an undervolt to around 895mv.
RX 580 is around 122 watts for 30.0mhs on Ethereum with an undervolt to around 950mv.
RX 480 can get a much lower power draw with undervolting, than the RX 580.
You would be wrong about the power draws for Ethereum.
Maybe you have some exceptional silicon? Most of the numbers I've seen on these boards are closer to 120W at the wall for rx580, i.e. about 750W for an ordinary 6-card rig. Seen plenty of people pulling 800-900 watts, probably bc they're not undervolting enough. My 580s are undervolted to around 850-860 and they pull about 115-120 from the wall while doing 29-29.5 on eth. They only pull about 90W on monero while doing 825-850 h/sec.
In any event, even if the magnitude is off, what matters is the relative power draw between eth and xmr. Even if the 580 is 98W for 29.5 mh/sec, xmr is better to mine at 75W for 850 h/sec.
RX 580 8GB review at 950mv undervolt - 121.8 watts for 30.05mhs
https://cryptoyeti.com/msi-rx580-armor-8g-review-and-bios-mod-guide/3/Use, HWINFO to verify that you GPUs are accepting those undervolts.
https://www.hwinfo.com/Because on RX Vega 56 - you cannot set an undervolt below 900mv via Adrenalin drivers.
I've confirmed that the undervolts are being accepted.
I find 659W for a 5-card rig doing 150 MH/sec believable. I get 174 MH/sec for about 750W.
My point is that the same 5-card rig would probably do at least 4,250 h/sec on monero and pull only about 500W.
The value of the eth mined is about the same as the value of the xmr mined.
I find 98W a bit hard to believe. I know some well optimized/tuned 470/480 rigs with good silicon can achieve something close to this, but I'm skeptical it can be done with a 580. Maybe a freak card here or there.
Well,
That is one opinion, the record claimed by a Bitcointalk forum member is 29.3mhs for 77.5watts (Apneal) using Sapphire Nitro+ RX580 Limited Edition.
Check out his thread:
https://bitcointalk.org/index.php?topic=1881008.0As a tip: the key is to lower the memory voltage and the GPU speed down.
He has a graph of his results, with GPU core voltages, memory voltages, memory strap used, GPU speeds and memory speeds.
Umm, that 77.5 number is the chip power, and not from the wall. Total power is roughly two parts chip and 1 part VRM. That's at least 115W consumed by the card. Depending on efficiency of the PSU used, that's 120-130 watts from the wall, which is about right from my experience.
Just add on 25watts to his figures.
Za1n, on that ANN is saying he is doing, 102watts at 30mhs (down from 108watts after tinkering) with 92% efficient power supply measured at the wall.
And, 120/125 watts in dualmining Ethereum and Decred.
And, as Kilo7 says on that ANN: there are lots of RX 480 sub-100watt roms available for just mining Ethereum.
That 108 (later 102) is the power consumed by the card, not at the wall. His 6-card rig pulls 760 from the wall, mine did 750.
760 from the wall means his cards are pulling about 120 each from the wall. Again, that's about right.
Za1n:
"My raw power usage data is:
Total rig draw: 760W (kill-a-watt reading)
PSU 92% efficient (8% inefficient): 760 - 60.8 = 699.2W (or just 760*0.92).
System idle draw (50 watts): 700 - 50 = 650W
Draw per card: 650 / 6 = ~108W"
Above are the raw stats from Za1n, before he fine-tuned his rig.
After fine tuning, Za1n drew 714watts from the wall.
On a Platinum PSU, 94% he would be at 698watts.
His system idle draw is 50 watts - when you are running mining software the system will consume more power - around 80watts from my experience.
This puts, his GPUs power draw around 105watts on his Gold certified PSU or 103 watts on a Platinium certified PSU at the wall.
Za1n, is not trying to set the lowest power consumption, he is using 900mv and 1125 GPU speed. He has headroom to reduce voltages and GPU speeds.