Quote from: crazyates on January 11, 2014, 07:30:04 PM

Quote from: boxofspuds on December 18, 2013, 09:21:50 AM

Quote from: gemini on December 11, 2013, 01:32:08 AM

Hi there
Is there any way to undervolt r9 280x under linux (SMOS/BAMT to be exact)? I've seen people changing BIOS for HD7970 to undervolt but didn't found any bios editor for r9 280x.
Anyway would rather like use software command if possible. Or I have to use Windows for that purpose?

Cgminer of course ignores voltage settings.

not the prettiest or simplest while looking for that stable voltage, but this looks to be a verified way to undervolt in linux.

http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/
not sure if it is working 280xs though... also what kind of card do you have. it simply may not be voltage unlocked in the first place.

Confirmed that VBE7 does work with 280x cards. Flashed half a dozen Gigabyte 280xs this week, and they're all hashing @ 725KH/s @ 1.019V. Dropped consumption for a 5 GPU rig frim 1450W to 1250W, and lower temps as well. Test on one going lower and lower, and then flashing the others only took me ~5-10 minutes per card.

What are the other settings that you're using? I mean core and mem in cgminer/sgminer.

Did you also change those settings in the bios?

Best regards,
ilpirata79