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Does the D3 modified firmware enable you to increase the hash rate rather than decrease the power? And, if you run it at 19GH/s (or more) with the modified firmware, will it use less power than it would with the official firmware?
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Stock firmware lets you change frequency, cutom firmware allows to change voltage as well and if you want you can set it individually for each hashing board so you have more control. What you choose to do is up to you and results will vary on each individual device. I could really use individual hashing board settings on one of L3+s as it's got 3 boards that overclock well and one that does not.
From the development thread
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Some startup settings to get you going:
for silence and best efficiency / miner lifetime (my personal preference)
Expected hashrate: 15Mh/s to 17 Mh/s
Expected power usage: 700 - 780 watt
set the frequency at "400mhz", set the voltage to "lowest". Now slowly increase the frequency until you see HW errors. When you have a few HW errors an hour you found the sweet spot
set the fan speed manual somewhere between 20 - 30 percent. Chip temp should be somewhere between 75 - 80 degrees max.
For stock performance at lowest possible power usage
Expected hashrate: 18-5Mh/s to 19Mh/s
Expected power usage: 950 - 1100 watt
set the fan speed to automatic mode.
set the frequency at "525mhz", set the voltage to "13". Now decrease the voltage until you see HW errors. When you have a few HW errors an hour you found the sweet spot
For Extreme performance (this is not recommended for 24/7 usage)
Expected hashrate: 21Mh/s
Expected power usage: 1300 - 1400 watt
set the fan speed to automatic mode.
set the frequency at "600mhz", set the voltage to "18". Now decrease the voltage until you see HW errors. When you have a few HW errors an hour you found the sweet spot
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Before NiceHash went down D3 was earning less than £5/day there with about £2.40 electricity costs so would have taken very long time to pay back £1600 investment. So I decided to play a long game, optimise it for low power consumption, mine Dash directly, keep it and hope for price to increase. But at it's underclocked state it's earning about £9/day with £1.75 costs on MRR and is rented out almost all the time so I will probably raise the speed near to what it was at stock and earn about £11/day.
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PS - Just had notification that my S9 from the January batch is on it's way already!
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For me only PSU has shipped last week and should be arriving today, S9 itself has not shipped yet.
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I reckon it was the Norks who hacked Nicehash. Kim is probably spending our BTC on building more missiles.
I set my Vega rig up on Miningpoolhub as it can auto-switch currency per algo depending on the best return, and will auto-exchange earnings to the currency of your choice which is pretty handy. It only does Monero on XMR at the moment but could switch to Electroneum when its supported if it was paying better. It was running at about £12 a day before fees, but I was away over the weekend so it was shut down as I still don't know if its stable. I'm going to crank up the fan speeds this evening and run it overnight to see what it does. I read somewhere that the card's reported temperature was the GPU core, but the memory runs quite a bit hotter. Since the GPU has been at 75*, toasty memory could account for the random crashes. Fingers crossed...
After two hours its running at a steady 3.6KH/s, both GPUs reporting ~50*C. Cast-XMR seems to get more H/s from these cards, but XMR-stak has a watchdog timer to reboot if the GPU crashes so sticking with that for now.
Update: 11pm, still going, but the return looks far lower than the figures initially suggested - its only made £1 in 7 hours MPH does PPLNS payment though which apparently takes longer to see returns but pays a bit better according to an FAQ I found somewhere else. I'm going to run it for as long as it stays stable and see what happens.
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Single Vega does about £8-9 per day for me on miningrigrentals and is rented out most of the time. when not rented it mines Electroneum directly about £7 per day but I am keeping that and no t cashing in as its not cost effective for small quantities and waiting for pice to rise. some predict price to be £20-30 by the March 2018 instead of current £0.07-0.08.