7970 undervolting

[lightlord]

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.

[1714779744]

1714779744

[lightlord]

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 +

[lightlord]

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.

[ddd1]

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?

[goxed]

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

[crazyates]

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.

[jjiimm_64]

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

[cmg5461]

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

[jjiimm_64]

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

[crazyates]

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...

[jjiimm_64]

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

[joshv06]

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.

[goxed]

Can I undervolt a 7970 card in Linux?

[cmg5461]

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

[ThiagoCMC]

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!
Thiago

[ThiagoCMC]

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

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

[goxed]

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.

[ThiagoCMC]

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

[btcnut]

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

Are you running all 7970's? What drivers and setup are you using to get windows to recognise all 5 GPU's? Are you using XP/Vista/Windows 7? 32bit or 64bit?

I cant for the life of me get more than 4 gpus going at once.

[Mousepotato]

Wait, how are you guys undervolting with MSI Afterburner?  My voltage slider is blank... is there some option/setting I have to turn on or something?