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Author Topic: 7970 undervolting  (Read 16270 times)
cmg5461
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April 05, 2012, 04:34:10 AM
 #1





Still venturing lower Cheesy

Clock: 1000mhz
Memory: 710mhz
Voltage: 0.968

Mhash/s: 580

Power based on GPU-Z

(12.09v * 10.5A) = 127W

Take into account 85% efficienct: 127*1.15 = 146W

580/146W = 3.97 Mhash/W

Smiley

Update:

Dropped voltage down to .955v 100% stable.



(12.09v * 10.2A) = 123.3W

85% efficiency: 123.3*1.15 = 141.8W

580/141.8 = 4.09Mhash/W

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April 05, 2012, 02:18:05 PM
 #2

wow, what programs do you use to set the clock speed/memory/voltage?

For a long time i was running mine at 978mhz 1.043v with MSI afterburner beta
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April 05, 2012, 02:20:03 PM
 #3

85% efficiency?  Get a better PSU.

Also would be nice if you have/get a Kill-A-Watt so you can compare calculated load @ wall w/ actual load at wall.
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April 05, 2012, 02:22:04 PM
 #4

Also what card are you using? I seem to have better luck with the Black Edition cards as they appear to be higher binned.
cmg5461
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April 05, 2012, 03:46:23 PM
 #5

85% efficiency?  Get a better PSU.

Also would be nice if you have/get a Kill-A-Watt so you can compare calculated load @ wall w/ actual load at wall.

Working on it. And it's in the computer I'm running now.  When I upgrade I'll buy a higher quality one.

wow, what programs do you use to set the clock speed/memory/voltage?

For a long time i was running mine at 978mhz 1.043v with MSI afterburner beta

Msi afterburner.  I downclock memory in cgminer, because afterburner doesn't like to lower it past 850.

Also what card are you using? I seem to have better luck with the Black Edition cards as they appear to be higher binned.

xfx 7970 black edition.  76.7% ASIC quality

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April 05, 2012, 04:23:41 PM
 #6

85% efficiency?  Get a better PSU.

Also would be nice if you have/get a Kill-A-Watt so you can compare calculated load @ wall w/ actual load at wall.

Very interesting. Also interested in the actual load as I don't believe the input power for the memory, while tiny, is included. Might be time to pick up a used 7970 myself.

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April 05, 2012, 04:39:01 PM
 #7


Quote

xfx 7970 black edition.  76.7% ASIC quality

How do you get ASIC quality in the 7xxx cards ?

Thanks !
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April 05, 2012, 07:11:34 PM
 #8


Quote

xfx 7970 black edition.  76.7% ASIC quality

How do you get ASIC quality in the 7xxx cards ?

Thanks !

Its built into GPU-Z as far as I am aware.
scifimike12
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April 05, 2012, 07:51:11 PM
 #9

85% efficiency?  Get a better more efficient PSU.

Fixed that for you.  Remember, just because a PSU is rated at 80+ Bronze, Silver, Gold, etc. doesn't mean it is "high quality".  I'd rather take an Antec TruePower New over a ABS Majesty or Mushkin Enhanced any day of the week.

How do you get ASIC quality in the 7xxx cards ?

Thanks !

Right-click the toolbar and select Read ASIC quality...
cmg5461
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April 05, 2012, 08:18:12 PM
 #10

85% efficiency?  Get a better PSU.

Also would be nice if you have/get a Kill-A-Watt so you can compare calculated load @ wall w/ actual load at wall.

Very interesting. Also interested in the actual load as I don't believe the input power for the memory, while tiny, is included. Might be time to pick up a used 7970 myself.

Does not matter.  Voltage is read going into the card as well as the amperage.  Memory voltage is drawn off that main voltage.

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April 05, 2012, 09:05:05 PM
 #11

85% efficiency?  Get a better PSU.

Also would be nice if you have/get a Kill-A-Watt so you can compare calculated load @ wall w/ actual load at wall.

Very interesting. Also interested in the actual load as I don't believe the input power for the memory, while tiny, is included. Might be time to pick up a used 7970 myself.

Does not matter.  Voltage is read going into the card as well as the amperage.  Memory voltage is drawn off that main voltage.

Of course it matters.  The recorded CURRENT is VDDC which does not power the memory (or I/O).  A separate VRM provides CURRENT for memory, a third provides voltage for IO functions.    While the voltage remains the same without knowning the VDDCI & MVDDC current you don't know entire card consumption.

Total Power Consumption = Voltage * (VDDC current + VDDCI current + MVDDC current)

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April 05, 2012, 10:22:54 PM
 #12


Quote

xfx 7970 black edition.  76.7% ASIC quality

How do you get ASIC quality in the 7xxx cards ?

Thanks !

Its built into GPU-Z as far as I am aware.

I meant with Linux.

Just like you cannot use GPU-Z to see VRM temperatures.

Has anyone tried with WINE and GPU-Z Huh
cmg5461
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April 05, 2012, 10:46:49 PM
 #13


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April 06, 2012, 06:45:43 AM
 #14

cgminer.exe -o http://us.ozco.in:8332 -u graet.20 -p p -o http://eu.ozco.in:8332 -u graet.20 -p p -I 9 -k poclbm --auto-fan --gpu-engine 1140-1180 --auto-gpu --gpu-memdiff -150 --gpu-vddc 0.88 --temp-overheat 95

gives me 704Mhash @ 74 deg on one card, 680mh @ 83deg on other.

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April 07, 2012, 03:21:28 AM
 #15



I found HWinfo was pretty much in line with my calculated figures.

https://bitcointalk.org/index.php?topic=57410.0
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May 13, 2012, 08:56:48 AM
 #16

cgminer.exe -o http://us.ozco.in:8332 -u graet.20 -p p -o http://eu.ozco.in:8332 -u graet.20 -p p -I 9 -k poclbm --auto-fan --gpu-engine 1140-1180 --auto-gpu --gpu-memdiff -150 --gpu-vddc 0.88 --temp-overheat 95

gives me 704Mhash @ 74 deg on one card, 680mh @ 83deg on other.

Actually found out to be false. I got the exact same temperatures.
But I checked gpuz sensors and found out cgminer under-volt does nothing.
How ever I tried msi after burner lastest version undervolting and going down any where near 0.88 just crashes
and ati driver stops responding. I did mange to go from 1174>1156
A read out drop on the sensor from 1.07>1.04 VDDC

And any lower it crashes at 1180 OC

The above numbers are impossible, just fallacy.
I thought it was working too as well, and I realized it wasn't
Download GPU-Z

You aren't going mange a 20% under volt with a 930>1180!
Dream on, getting a 15% higher clock and 20% under volt is everyone's dream.
That simply can't be done.



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HAS BEEN RELEASED!


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May 13, 2012, 05:01:16 PM
 #17


I am running them at 930/800/0.937v

downvolt with msiafterburner, close AB  start cgminer with conf file.

pulling 830watts at the wall.   3.33 Mh/watt

Code:
cgminer version 2.3.6 - Started: [May 10, 2012, 8:52 am]    Rig:miner19
(5s):2772.32  (avg): 2759.81 Mh/s  |    H: 86.8  Q:168959   A:173544   R:927   HW:113   E:?%   U:38.07/m
TQ:?   ST:143   SS:?   DW:5646   NB:424   LW:80863   GF:222   RF:169
Connected to http://gpumax.com:8332 with LP as user ?
Value:
GPU 0: 72.0C 2504RPM 42% 114 | 554.3/552.1Mh/s | 99% | 930Mhz 800Mhz 1.17V A:34667 R:190 HW:0 U:7.60/m I: 9
GPU 1: 66.0C 1052RPM 0% 66 | 554.8/552.1Mh/s | 99% | 930Mhz 800Mhz 1.17V A:34859 R:198 HW:0 U:7.65/m I: 9
GPU 2: 72.0C 1184RPM 33% 105 | 554.7/552.1Mh/s | 99% | 930Mhz 800Mhz 1.17V A:34519 R:196 HW:88 U:7.57/m I: 9
GPU 3: 67.0C 1042RPM 0% 67 | 554.0/551.6Mh/s | 99% | 930Mhz 800Mhz 1.17V A:34762 R:171 HW:25 U:7.63/m I: 9
GPU 4: 72.0C 1092RPM 10% 82 | 554.6/552.0Mh/s | 98% | 930Mhz 800Mhz 1.17V A:34737 R:172 HW:0 U:7.62/m I: 9

1jimbitm6hAKTjKX4qurCNQubbnk2YsFw
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May 13, 2012, 05:09:44 PM
 #18

cgminer.exe -o http://us.ozco.in:8332 -u graet.20 -p p -o http://eu.ozco.in:8332 -u graet.20 -p p -I 9 -k poclbm --auto-fan --gpu-engine 1140-1180 --auto-gpu --gpu-memdiff -150 --gpu-vddc 0.88 --temp-overheat 95

gives me 704Mhash @ 74 deg on one card, 680mh @ 83deg on other.

Actually found out to be false. I got the exact same temperatures.
But I checked gpuz sensors and found out cgminer under-volt does nothing.
How ever I tried msi after burner lastest version undervolting and going down any where near 0.88 just crashes
and ati driver stops responding. I did mange to go from 1174>1156
A read out drop on the sensor from 1.07>1.04 VDDC

And any lower it crashes at 1180 OC

The above numbers are impossible, just fallacy.
I thought it was working too as well, and I realized it wasn't
Download GPU-Z

You aren't going mange a 20% under volt with a 930>1180!
Dream on, getting a 15% higher clock and 20% under volt is everyone's dream.
That simply can't be done.

I CANNOT run the cards at stock clocks with those settings, I start gpuz hashrate drops and cards crash

BUT the wattmeter plugged into the wall reads substantially lower, even though cgminer reports no change, proof is in the draw from the wall. fallacy all you like

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May 13, 2012, 11:20:15 PM
 #19

Do you guys use gpu-z/hwinfo64 to determiner the "real" VDDC?
Because It seems if you put VDDC in MSI AB it shows different in GPU-z.

Also Ive read there are different voltage leak on 7970, if memory serves me correct there is 1.17v, 1.111v and 1.05v.
So if you have the 1.111v card then putting 1.117v in Afterburner in reality gives 1.111v.

So if you put +0.020v in MSI AB so it is 1.190v in truth if you have a 1.111v card the "real" VDDC is 1.131v.

I think the above is true?
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May 14, 2012, 01:15:43 AM
 #20

I have a wattage meter device, and dropping 1174>1156 drops watts, but actually putting in 0.86 in Cgminer does completely nothing.
Wattage does stay same. Stayed at 430>430, no drop.

I really think you are miss looking over the numbers. Stock at 0.936 Volts is possible, but 1180/1100 at 0.86 is not possible.



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