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Title: How to undervolt 7950 vapor-x OC on linux Post by: jhk753 on June 04, 2013, 08:06:40 PM Hi everyone,
I just finished to configure a 3x 7950 sapphire vapor-x OC edition. It runs very well at 1920kh/s on xubuntu and it takes 800watt from the wall. But I want to improve the energy efficiency. First I have auto-fan with a target temp at 75C on CGminer. Second, I try to undervolt with CGminer, but the command doesn't change the voltage. Current config : Engine: 1080 Mem: 1500 volt: 1.15 I read a few things on how to undervolt vapor-x on windows, but does someone know how to do it on xubuntu ? Thanks a lot. Title: Re: How to undervolt 7950 vapor-x OC on linux Post by: SkyNet on June 04, 2013, 09:13:30 PM Well if you cannot do it with the cgminer switches (--gpu-vddc) most probably you are out of luck. Also try another driver version.
If both don't work Windows is the way to go. Afterburner and Trixx will do it. I don't think that you can undervolt a lot though with your current config (most probably 1.10) Title: Re: How to undervolt 7950 vapor-x OC on linux Post by: jhk753 on June 04, 2013, 09:29:25 PM Ok thanks
Title: Re: How to undervolt 7950 vapor-x OC on linux Post by: philips on June 04, 2013, 10:16:12 PM BIOS flash.
Title: Re: How to undervolt 7950 vapor-x OC on linux Post by: micitzu on June 08, 2013, 07:15:48 AM Hi,
Bios flash? I am using Sapphire VaporX 11196-09-40G and there is only 1 available bios for this GPU V49_V4A. Have you a modified version of the bios? I how that for the Gigabyte there is the F43 that is working very good. Have you installed the Gigabyte bios on the Sapphire card? At the moment I haven't been able to modifie the voltage on this cards (Trixx, Afterburner in win and amdOveridervoltage in xubuntu/ubuntu). If I go on a high level configuration it goes to 1.250V, even if from the various topics it uses only 1.115 or 1.150... I am not energy efficient at the moment... Looking forword to your imput I have tried: win 7 - 64 biti: - driver 12.8 / 13.1 / 13.4 (and all the available betas from 12.8 up) - SDK form 2.4 up xubuntu/ubuntu: 12.10 and 13.4 systems the same drivers... Title: Re: How to undervolt 7950 vapor-x OC on linux Post by: philips on June 08, 2013, 10:48:34 AM https://bitcointalk.org/index.php?topic=216474.msg2272704#msg2272704
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