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Author Topic: 7970 undervolting  (Read 16262 times)
jjiimm_64
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May 14, 2012, 02:37:39 AM
 #21

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.

i would have to agree.  i am doing 930 at 0.937v.  at 940 I was dropping cards.  at 930 you can see from my last post the rig has been up for days now.

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May 14, 2012, 03:49:32 AM
 #22

Okay I have tempered, and lowered the clocks very slowly, Btw the longer you run the hard ware the lower the voltage can go. After one year my Cpu was able to undervolt from 1.45>1.1875 Stable.
Where it used to not be stable at 1.35 or so. Its interesting.


7970 Stable Clocks
---------------------
1180 Core Clock, 700 Mhash, Msi after burner: 1174 -> 1156 MV -> Gpu-Z sensor: VDDC 1.04 Volts  (Any lower Crashes)
1100 Core Clock, 650 Mhash, Msi after burner: 1174 -> 1068 MV -> Gpu-Z sensor: VDDC 0.988 Volts  (Any lower Crashes)
1025 Core Clock, 600 Mhash  Msi after burner: 1174 -> 1024 MV -> Gpu-Z Sensor: VDDC 0.949 Volts (Any lower Crashes)

Seems like a diminishing return curve, around Core 1100, I yield the most mhash to least power/voltage.
1180 being least efficient, lower then 1100 being less efficient.



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May 14, 2012, 04:00:49 AM
 #23

Now going to push my card as high as it goes in core clock before crash. Lucky the new drivers just make it not respond and I don't have to restart computer really nice for over clocking.

Btw over clocking isn't what is dangerous, its overvolting that is.
So If I yeilded 1154 MV from 1174 MV at 1180, at stock 1174 MV I should get around 1200 +



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May 14, 2012, 04:11:12 AM
 #24

at 1230, it crashes within 5 seconds
at 1225, it crashes within 45 seconds
at 1220, it crashes within 2 mins with strange artifacts
at 1215, Currently running haven't crashed yet (Updated Just crashed)
at 1210, Trying now (crashed 10 mins)
at 1205, (crashed 10 mins)
at 1200 (20mins)

Threw the clock to 1190, hopefully it will be stable 24/7 at this when I go to sleep.



.
.BITVEST DICE.
HAS BEEN RELEASED!


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May 15, 2012, 08:45:30 PM
 #25

at 1230, it crashes within 5 seconds
at 1225, it crashes within 45 seconds
at 1220, it crashes within 2 mins with strange artifacts
at 1215, Currently running haven't crashed yet (Updated Just crashed)
at 1210, Trying now (crashed 10 mins)
at 1205, (crashed 10 mins)
at 1200 (20mins)

Threw the clock to 1190, hopefully it will be stable 24/7 at this when I go to sleep.


So you are testing stability with mining?

Which drivers cause PC to just crash and not shut off?
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May 24, 2012, 06:05:14 AM
 #26

Is there any software compiled for Linux that can allow me to under volt reference 7970  cards?

Looking to review Bitcoin / Crypto mining Hardware.
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May 24, 2012, 02:23:03 PM
 #27

at 1230, it crashes within 5 seconds
at 1225, it crashes within 45 seconds
at 1220, it crashes within 2 mins with strange artifacts
at 1215, Currently running haven't crashed yet (Updated Just crashed)
at 1210, Trying now (crashed 10 mins)
at 1205, (crashed 10 mins)
at 1200 (20mins)

Threw the clock to 1190, hopefully it will be stable 24/7 at this when I go to sleep.


So you are testing stability with mining?

Which drivers cause PC to just crash and not shut off?

I'm not using a 7970, but with Win7x64 and 12.4, if I OC too much, my screen flickers a few times and I get a warning that my graphics driver stopped responding. CGMiner is still open, but doesn't hash.

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May 24, 2012, 03:09:35 PM
 #28


my .2 bitcents...  stop trying to put gpus into warp drive... 

also, the topic is undervolting..  at stock volts and 1100 clock my rigs(5x7970) pulls 1440 watts at the wall.  at 930/300/.937 it pulls 835 watts...  huge difference

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May 24, 2012, 04:07:27 PM
 #29


my .2 bitcents...  stop trying to put gpus into warp drive... 

also, the topic is undervolting..  at stock volts and 1100 clock my rigs(5x7970) pulls 1440 watts at the wall.  at 930/300/.937 it pulls 835 watts...  huge difference


huge difference for an extra 750Mhash :p

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May 24, 2012, 04:16:07 PM
 #30


my .2 bitcents...  stop trying to put gpus into warp drive...  

also, the topic is undervolting..  at stock volts and 1100 clock my rigs(5x7970) pulls 1440 watts at the wall.  at 930/300/.937 it pulls 835 watts...  huge difference


huge difference for an extra 750Mhash :p

so you going to pay 600 watts for 750 mhash?   do you have free electric?

lets put this into perspective:

600 watts is ~ 47.50 $  at .11 p/kwh
750M at current diff is   $66.16 per month

so to make all that extra heat, you pay 20 bucks a month!  you loose money to over clock that much

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May 24, 2012, 04:18:46 PM
 #31


my .2 bitcents...  stop trying to put gpus into warp drive... 

also, the topic is undervolting..  at stock volts and 1100 clock my rigs(5x7970) pulls 1440 watts at the wall.  at 930/300/.937 it pulls 835 watts...  huge difference


huge difference for an extra 750Mhash :p

As much as I like my OC and squeezing every last hash out of my cards, there is a case for downclocking. Adding an extra 600W for 750MH/s is quite inefficient...

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May 24, 2012, 04:20:58 PM
 #32


my .2 bitcents...  stop trying to put gpus into warp drive... 

also, the topic is undervolting..  at stock volts and 1100 clock my rigs(5x7970) pulls 1440 watts at the wall.  at 930/300/.937 it pulls 835 watts...  huge difference


huge difference for an extra 750Mhash :p

As much as I like my OC and squeezing every last hash out of my cards, there is a case for downclocking. Adding an extra 600W for 750MH/s is quite inefficient...

that is an understatement..  it costs money
600 watts is ~ 47.50 $  at .11 p/kwh
750M at current diff is   $66.16 per month

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May 24, 2012, 04:27:19 PM
 #33

Okay I have tempered, and lowered the clocks very slowly, Btw the longer you run the hard ware the lower the voltage can go. After one year my Cpu was able to undervolt from 1.45>1.1875 Stable.
Where it used to not be stable at 1.35 or so. Its interesting.


7970 Stable Clocks
---------------------
1180 Core Clock, 700 Mhash, Msi after burner: 1174 -> 1156 MV -> Gpu-Z sensor: VDDC 1.04 Volts  (Any lower Crashes)
1100 Core Clock, 650 Mhash, Msi after burner: 1174 -> 1068 MV -> Gpu-Z sensor: VDDC 0.988 Volts  (Any lower Crashes)
1025 Core Clock, 600 Mhash  Msi after burner: 1174 -> 1024 MV -> Gpu-Z Sensor: VDDC 0.949 Volts (Any lower Crashes)

Seems like a diminishing return curve, around Core 1100, I yield the most mhash to least power/voltage.
1180 being least efficient, lower then 1100 being less efficient.

Try running at e: 925, m: 85 v: 0.925  (GPU-Z sensor: 0.867 V) cgminer hashes at 530, each card is consuming about 90-95W.
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May 24, 2012, 04:29:34 PM
 #34

Yes I agree, I think it's best to push for best Mhash/W optimum profits, rather than just trying to get the most Mhash.

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May 25, 2012, 12:30:04 AM
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Can I undervolt a 7970 card in Linux?

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May 25, 2012, 12:34:22 AM
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my .2 bitcents...  stop trying to put gpus into warp drive...  

also, the topic is undervolting..  at stock volts and 1100 clock my rigs(5x7970) pulls 1440 watts at the wall.  at 930/300/.937 it pulls 835 watts...  huge difference


huge difference for an extra 750Mhash :p

so you going to pay 600 watts for 750 mhash?   do you have free electric?

lets put this into perspective:

600 watts is ~ 47.50 $  at .11 p/kwh
750M at current diff is   $66.16 per month

so to make all that extra heat, you pay 20 bucks a month!  you loose money to over clock that much

You didn't see my sarcasm there :p

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August 14, 2012, 07:19:35 AM
 #37

Can I undervolt a 7970 card in Linux?

AMDoverdrive ?!

It is on my queue to undervolt my 7970 under Ubuntu Linux 64 bits / Catalyst 12.6 / CGMiner 2.6.4...

If anyone already does that, please, share it!

Cheers!
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August 14, 2012, 07:29:46 PM
 #38

I'll try this one under Ubuntu Linux 12.04 64 bits:

http://sourceforge.net/projects/amdovdrvctrl/

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August 15, 2012, 01:25:21 AM
 #39

I'll try this one under Ubuntu Linux 12.04 64 bits:

http://sourceforge.net/projects/amdovdrvctrl/

Is ADL able to undervolt in Linux? I think CGMINER uses ADL, and it doesn't work for me in Linux. What works for me is flashing a 7950 BIOS to a 7970 card. Reduces the voltage to 1.03V or so. I would be very interested in the undervolting results using amdovdrvctrl on Tahiti chips.

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August 16, 2012, 05:29:17 AM
 #40

Okay, it is impossible to undervolt those cards under Linux...  Damn...

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