Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer

[ungaro59]

Hello,

I have a rig with two cards Sapphire HD 7950 3Go OC :
http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1157&pid=1450&lid=1

11196-02-40G
Vddc : 1.25V
Clock : 925Mhz
DDR5 : 1250Mhz

I want to undervolt to 1.15V the TWO cards in the same time when Windows starting (it reduces consumption 40-50W).
I changed two cards at 1,15V and save the profile in Sapphire TriXX.
But when windows restart, only 1 card is undervolt, the second card is back to 1,25V.  

Do you know an utility that allows you to change the voltage of these cards ?
Trixx does not work well with these cards.

Thank you in advance.

[skleven]

So no luck lowering the volt in cgminer either?

[ungaro59]

So no luck lowering the volt in cgminer either?

No, it does not work with cgminer.

[ineedit]

Hello,

I have a rig with two cards Sapphire HD 7950 3Go OC :
http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1157&pid=1450&lid=1

11196-02-40G
Vddc : 1.25V
Clock : 925Mhz
DDR5 : 1250Mhz

I want to undervolt to 1.15V the TWO cards in the same time when Windows starting (it reduces consumption 40-50W).
I changed two cards at 1,15V and save the profile in Sapphire TriXX.
But when windows restart, only 1 card is undervolt, the second card is back to 1,25V.  

Do you know an utility that allows you to change the voltage of these cards ?
Trixx does not work well with these cards.

Thank you in advance.

Are the BIOS versions the same?

[ungaro59]

Are the BIOS versions the same?

Yes, these are exactly the same cards and bios versions.

[skleven]

So no luck lowering the volt in cgminer either?

No, it does not work with cgminer.

Many weird things have happened in my time as a miner. So just to check, have you tried to run them in crossfire?

[ungaro59]

So no luck lowering the volt in cgminer either?

No, it does not work with cgminer.

Many weird things have happened in my time as a miner. So just to check, have you tried to run them in crossfire?

No, I have not tried because it seems to me that cgminer do not like this..??
And thereafter, I want to put 5 cards in the rig.

[skleven]

So no luck lowering the volt in cgminer either?

No, it does not work with cgminer.

Many weird things have happened in my time as a miner. So just to check, have you tried to run them in crossfire?

No, I have not tried because it seems to me that cgminer do not like this..??

That is correct, but it was just to find out if it did any difference.

[chup]

Do you know an utility that allows you to change the voltage of these cards ?
Trixx does not work well with these cards.

Thank you in advance.

Have You tried checking box "Synchronize cards in Multi-GPU config" under Trixx settings?
AFAIK "Disable ULPS" should be ticked as well...

[ungaro59]

I tried several possibilities. The only one who can change the voltage of a card seems to be the options below :



but only One card. The first card is ok. The second, no.

The first card :


The Second card :



 

[Wipeout2097]

You must mod and reflash the bios then

http://www.techpowerup.com/forums/threads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/

[ineedit]

Inspect the cards and see if they are the same revision?

This happens with Gigabyte 7950 Windforce as well, with rev 1 cards you can change the voltage but with rev 2 cards you cannot as the control circuits to do so have not bee added to the board.

[ungaro59]

Inspect the cards and see if they are the same revision?

This happens with Gigabyte 7950 Windforce as well, with rev 1 cards you can change the voltage but with rev 2 cards you cannot as the control circuits to do so have not bee added to the board.

Yes it's the same revision.

You must mod and reflash the bios then

http://www.techpowerup.com/forums/threads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/

Unfortunately, voltage regulator is Unknow.

Do you think I can still flash by changing the voltage ?

[ineedit]

...

Unfortunately, voltage regulator is Unknow.

Do you think I can still flash by changing the voltage ?

Where did you get these cards from, what is their history?

[ungaro59]

...

Unfortunately, voltage regulator is Unknow.

Do you think I can still flash by changing the voltage ?

Where did you get these cards from, what is their history?

These are the latest graphics cards bought 15 days ago :

link :
http://www.amazon.com/Sapphire-11196-02-40G-PCI-Express-Version-Graphics/dp/B0070APVP2/ref=pd_sxp_f_pt

[ineedit]

...

Unfortunately, voltage regulator is Unknow.

Do you think I can still flash by changing the voltage ?

Where did you get these cards from, what is their history?

These are the latest graphics cards bought 15 days ago :

link :
http://www.amazon.com/Sapphire-11196-02-40G-PCI-Express-Version-Graphics/dp/B0070APVP2/ref=pd_sxp_f_pt

Odd as the BIOS you have on them is listed for a 280x not a 7950. I would flash them with a listed BIOS and try again. Take a copy of the original BIOS though just in case.