|
Title: Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer Post by: ungaro59 on December 31, 2013, 05:43:40 PM 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. Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: skleven on December 31, 2013, 05:46:06 PM So no luck lowering the volt in cgminer either?
Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: ungaro59 on December 31, 2013, 05:47:13 PM So no luck lowering the volt in cgminer either? No, it does not work with cgminer. Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: ineedit on December 31, 2013, 05:48:14 PM 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? Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: ungaro59 on December 31, 2013, 05:49:53 PM Quote Are the BIOS versions the same? Yes, these are exactly the same cards and bios versions. http://gpuz.techpowerup.com/13/12/31/5mk.png Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: skleven on December 31, 2013, 05:53:39 PM 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? Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: ungaro59 on December 31, 2013, 05:55:48 PM 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. Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: skleven on December 31, 2013, 05:57:48 PM 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. Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: chup on December 31, 2013, 06:04:19 PM 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... Title: Re: Need help running dual Sapphire 7950 OC w/cgminer Post by: ungaro59 on December 31, 2013, 06:22:31 PM I tried several possibilities. The only one who can change the voltage of a card seems to be the options below :
http://img15.hostingpics.net/thumbs/mini_561736trixx.jpg (http://www.hostingpics.net/viewer.php?id=561736trixx.jpg) but only One card. The first card is ok. The second, no. The first card : http://img15.hostingpics.net/thumbs/mini_206275first.jpg (http://www.hostingpics.net/viewer.php?id=206275first.jpg) The Second card : http://img15.hostingpics.net/thumbs/mini_604613second.jpg (http://www.hostingpics.net/viewer.php?id=604613second.jpg) ??? Title: Re: Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer Post by: Wipeout2097 on December 31, 2013, 08:42:46 PM You must mod and reflash the bios then
http://www.techpowerup.com/forums/threads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/ Title: Re: Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer Post by: ineedit on January 01, 2014, 02:21:48 PM 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. Title: Re: Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer Post by: ungaro59 on January 01, 2014, 03:40:39 PM 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. http://img11.hostingpics.net/thumbs/mini_737525vbe7.jpg (http://www.hostingpics.net/viewer.php?id=737525vbe7.jpg) You must mod and reflash the bios then http://www.techpowerup.com/forums/threads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/ http://img11.hostingpics.net/thumbs/mini_502966VBE72.jpg (http://www.hostingpics.net/viewer.php?id=502966VBE72.jpg) Unfortunately, voltage regulator is Unknow. Do you think I can still flash by changing the voltage ? Title: Re: Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer Post by: ineedit on January 01, 2014, 04:34:33 PM ... 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? Title: Re: Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer Post by: ungaro59 on January 01, 2014, 08:20:47 PM ... 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 Title: Re: Need help UnderVolt dual Sapphire 7950 OC 3Go w/cgminer Post by: ineedit on January 02, 2014, 08:42:16 AM ... 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. |
