Mining Optimization for Power Consumption
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Has anyone seen anything related to optimizing a GPUs hash rate and power consumption to get the best KH/w? I have been tinkering with my kill-a-watt, clock speeds, and voltages. I have been able to drop my temps and voltages substantially on my 7970 by scaling the clocks down without much loss to KH/s rate.
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I clocked down just the mem clock on my 6670 and got less power consumption without a loss in hashrate.
Well the hashrate is not very high anyway, just ~ 130 khash/s ;)
mem clock from 1080 to 780, power consumption from 60W to 40W on the card.
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[quote name=“RIPPEDDRAGON” post=“32399” timestamp=“1382622767”]
Has anyone seen anything related to optimizing a GPUs hash rate and power consumption to get the best KH/w? I have been tinkering with my kill-a-watt, clock speeds, and voltages. I have been able to drop my temps and voltages substantially on my 7970 by scaling the clocks down without much loss to KH/s rate.
[/quote]interessting. what settings and what power consumption before/after have you got?
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for all tests i use these settings as they scale really well:
–scan-time 1 --expiry 1 --queue 0 --thread-concurrency 21105 -I 13 -w 512 -g 2I am running 2x MSI 7970s and adjusted all of my other settings with afterburner.
Results:
GPU Clock - Memclock - Core Voltage MV - Temp C - KH/s - Watts - KHs/Watts
1045 - 1495 - 1113 - 78 - 1480 - 725 - 2.04
900 - 1250 - 1000 - 70 - 1275 - 577 - 2.21
900 - 1250 - 950 - 67 - 1275 - 542 - 2.35Idle Watts: 261 - NOTE: this includes network and other system gear and run on a 1000w bronze PSU
724-261 is an increase of 464 watts at load while
542-261 is an increase of 281 watts at load…WOWI don’t know how much these cards are drawing at idle and I wish i had those numbers. The most shocking part of this was seeing that I could run 2x 7970s on a 550w PSU. That is good news as I my new rig is coming and I am moving these over into a Bitfenix Prodigy build with a 600W seasonic gold psu.
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Anyone else have some power consumption numbers to share?
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Actually it’s true on many cards that ram speeds don’t correlate to hash rates, or at least they don’t scale up well. There is a huge savings in power for down clocking ram and up clocking the GPU.
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Just killed another 7970.
That means 2x 7970 dead, and 3x7950 dead…
I need to go for lower speed/power
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You need to do sommat! Running all 20 of mine flat out and still only ever blown 2. :o
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I just ordered a mini itx rig, i will have 3 machines to swap around here now. I am finally going to take my main machine (x58 i7 930 @4.2) offline for a series of RMAs that I have needed to do for a while. I will get to move my 7970s into an awesome 3770k with an Asus Maximus V Extreme that I picked up lightly used 5 months ago and my 7950 will move to the ITX box.
I am hoping to isolate the systems for some KH/Watts testing and improve my efficiency. I would really like to see if I can keep a 7970 above 600KH/s drawing less than 150 watts per card at the wall. I think this will be achievable on a gold+ psu and some tweaking. I am also planning on doing the same with my 7950 but I have no idea whats going to happen. My 7950 has not been the greatest hasher but I might be able to whip it into shape dropping down to 550KH/s and I would hope to be able to do this at 125 watts or less. I will update as I get more info, but after running this config on my 7970s for several weeks I am impressed.
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After plugging and unplugging things and running some numbers and playing with voltages this afternoon these were the results:
My 2x 7970s were averaging 285 watts each at 740KH/s
After the changes they dropped to 190 watts per card and 638KH/s each and 12c cooler using 940MV per card740/285 = 2.6 KH/watt
638/190 = 3.36 KH/wattA scrypt FPGA (koolio’s numbers):
1000/150 = 6.67 KH/wattThat above is a ~29% boost in efficiency with some minor tweaks. My next goal is to see if I can increase the hash rate of these cards while leaving the core clock, memory clock, and core voltage alone. Remember these numbers are from the wall and on an old 80+ bronze PSU. With a more efficient PSU I might be able to get the cards down to about 165-175 watts each at the wall. I also have no access to the memory voltages and that could be another source for power reduction.
When my new ITX rig arrives expect some more number and the same analysis of a 7950.
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Got them down to 180 watts and same hashrate with a few tweaks, memory is a funny thing.
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Thanks for the info.
I’d hope to keep my hash rate as high as I can, but save power. I’ll prob go with standard clock / slightly over, under clock the memory, and maybe the voltage lowered also.
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I reduced my power by about 200 watts by decreasing the engine speed. 1.2 kwh to 1kwh.
I didn’t try reducing the memory speed tho’, once you get everything running, its hard to touch the rig without making it worse. 6950 / 6970 / 6770.
I certainly was lucky early on when you don’t know whats high, only to blow up 2 power supplies, not the GPUs!
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I am now running at 650KH/s per 7970 and 180 watts per card putting me at 3.6KH/w
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thanks for this info. i bookmarked it. Will be adding a bunch of 280x in my rigs this week.
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[quote name=“angloblaxon” post=“38793” timestamp=“1386006403”]
thanks for this info. i bookmarked it. Will be adding a bunch of 280x in my rigs this week.
[/quote]I have 6 280x Sapphires coming this week as well. I will be posting usage and hash rates for these when I get them.
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looking forward to it! i need it more so to fit 6 cards into one mine. :)
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svennand when you killed ur cards, how long did they last? how many % did you overclock it by? did u overclock the mem as well?
how are you all getting the Watt per card? are you guys using a program to read it?
how come all i see is people underclocking, is no body overclocking?
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Ordered 3x Gigabyte R9 280x last night, only 2 are coming though. Should have numbers on those in the next week or so and the Sapphires are back ordered for another 2-3 weeks.
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Well i got 4 saphire vapor x R9 280x running right now. 2 in one machine that was runing at 740 kh/s per a card but was drawing 720w with temps around 83. soon as i get a rig stand they coming out of case. I dropped the clocks to 975 and voltage to 1.043. Power consumption dropped to 550 or so. hash rate to 690 kh/s. temps dropped to 74. once i get a rig stand they will probably drop more temp. I basically sacrificed around 90 kh/s for almost 200w. this machine does have 5 fans and a 165w processor in it. working on getting it more optimized for mining. it was my gaming rig that got sacrifice to the mining gods.
the second machine i dropped clocks to 1070 and voltage to 1.111 and kh/s states at 700 with around 520 watts even saw it hit 480 for awhile. temps around 74 also this machine has a 65w processor a hard drive and that’s it.
a fifth card is running in a machine of my brothers by it self and never breaks the 60s in temps and stock voltage so spacing these cards out would defiantly help with temps.
i basically sacrificed 160 kh/s for clos to 400 watts and lower temps. once i get some rig stands and consolidate to one rig i will optimize them some more.
