My five units are running at various speeds and power draw: 1489 watts, 1521watts, 1656 watts on 220V single phase and one at 1688 watts 110v using an EVGA 1600 G2. (5th unit I have not checked wattage but pulling 7 amps on 220V). room temperature is 70 degrees
Hashrates showing on Dragonmint miner status page: 15.13TH/s, 15.86TH/s, 15.38TH/s, 15.42TH/s, & 15.40TH/s (slushpool)
Are u sure?? If so, how did they pull off their demo video off
https://www.youtube.com/watch?v=SRCsQUyR7_IIt showed 16.26 TH at 1470 watts? Recheck your readings perhaps. That video was using the standard PSU.
This video was in nov 2017, about 4-5 months back.
Your room temperature is 21 degrees celcius, converted from farenheit. At wat temps are your miners running?
S9 is around 13.8TH for 1420w in hagsfin review -
https://bitcointalk.org/index.php?topic=2676763 This S9 is on 220-240v wall socket, same as the T1 numbers here.
S9 - 1420w/13.8th = 102.9 watts per TH
T1 - 1489w/15.13th = 98.41 watts per TH
T1 - 1521w/15.86th = 95.90 watts per TH
T1 - 1656w/15.38th = 107.67 watts per TH
T1 - 1688w/15.42th = 109.46 watts per TH
It is at around 5-7% more efficient as S9 with those numbers u mention. If the 1600+ watt range were used, it can be less efficient than an S9.
Can u double check because it makes no sense how it is that far apart. 1688w and 1489 watts is a 199 watts difference. It does not seem right.
The wattage and Hashrate numbers you quoted are accurate but how it was paired up may have been wrong.
Here are TH/s & wattage for 4 rigs I am looking at right now:
#1: 15.15TH/s @ 1647w (Myrig PSU). 108.71w per TH
#2: 15.42TH/s @ 1586w (Myrig PSU). 102.85w per TH
#3: 15.51TH/s @ 1477w (Myrig PSU). 95.23w per TH
#4: 15.24Th/s @1680w (EVGA 1600 G2). 110.24 TH
Hashrate is fairly stable when raising room temps from 70 degrees F to 80 degrees F
Wattage is taken from APC AP8641 PDU display on #1, 2, & 3. Wall outlet meter being used on #4
board temps range from 66-75 degrees, not sure why so much variance from one rig to the next but hopefully new firmware will improve power consumption and hashrate.
I just swapped out rig #1 Myrig PSU with Bitmain 1600watt PSU and saw no improvement in numbers. Wish I had some larger PSU's and try what Phil suggested.
Rig #5 is at home and I ran it in a much cooler room temp over night to see what would happen and the hash rate dropped from 15.40 TH/s to below 13.0TH/s.
EDIT: I warmed up the room
and happy to report it is hashing 16.3 TH/s on slushEDIT 2: Hashrate back down to 14.50TH/s
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