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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.

Use window...

tried in windows, same thing!
Cgminer ignores voltage settings!

not all R9 280x are unlockable. My 280x are the MSI version and i believe (from what i remember researching when i bought them) i could only find that the saphhire and MSI ones were unlockable.

I use MSI afterburner to undervolt my MSI 280xs and AMD catalyst to undervolt my 290s

How do you undervolt your R9 290 using catalyst?  I have been trying for days but I can find my voltage control.

  Sorry to highjack the thread.

  Phad

You can't, because its R9 290.... wait until they come out with a later version...

Could you possibly share your MSI 's BIOS? My MSI 280x cards are locked.

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.



http://www.techpowerup.com/vgabios/146769/msi-r9280x-3072-131009.html
But  youre MSI should NOT be vltage locked.  There's a setting in MSI afterburner that "unlocks" the voltage settings or something like that I think.  this thread talks about it
https://litecointalk.org/index.php?topic=8435.0

USE afterburner, should work better then cgminer....

Use msi afterburner. But undervolting is a bit tricky because the memory OC goes to crap if you reduce the voltage on the 290.

What do you mean? Like crashes?

I found settings without undervolting that got me to 840 Kh/s at 83 degrees and ~65% fan.  I feel good about that so I am not going to bother undervolting until I have a few more cards and power becomes a much bigger issue.

  Phad.

Would be nice which settings you are using for get 840kh/s :)

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.

I am not sure but it should work the same way using HD 7970...

Hey bro is your 1.019 the VBE7 setting or what GPUZ reports?

I'm using Linux, so I can't tell you what GPUz reports. I do know that the 1.019V is what VBE7 reports, and then after the flash CGMiner reports the same value. Also, power consumption dropped by ~200W for the 5 GPU rig, and temps went down a good bit as well, so I'm pretty confident that it worked. ;)

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Very nice :D

ATIFLASH or ATIWINFLASH will work for flashing the BIOS.

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I've got two XFX R9 280X Radeon cards, each in a separate computer, both running Ubuntu 13.10. I just built the second box yesterday. After much tweaking, I can get the first one to stay at 724 KHz when I'm not doing anything else on the computer.
I've had this box going 24/7 for almost 3 weeks now at 724 (when all else idle), plus the temp stays around 72 C.
I use this config:
-I 13 -g 2 -w 256 --gpu-engine 1027 --gpu-memclock 1500 --gpu-powertune -5 --no-submit-stale  --auto-fan --thread-concurrency 11200 --lookup-gap 2

I found that changing the engine or memclock higher actually makes it go slower, and powertune of -20 or -5 don't make a difference.
TC of 8192 which a lot of people use, also makes it go slower. I delete the .bin files before use (Tahiti)
So I'm satisfied with it, for sure.

On the second box though, with the same card (and exact same command line), it will start out at 700+ after the first 30 secs or so of "settling in", but after a few minutes gradually drop down to an average of only about 609 KHs over a period of time, with nothing else running and unattended. Also it runs around 76 C at this lower rate.  Wonder what's the reason for this?
Also want to mention, I'm using a USB stick wifi unit for internet, while the first box is direct to the Ethernet via cable. May that or the pool itself have some influence on what gets accepted and how fast?

How are you guys getting your Linux boxes to read cgminer gpu configs?  My Xubuntu 13.10 with cgminer 3.7.2 doesn't read the --gpu-engine or --gpu-memclock settings.  Either in the bash script or the config file.

VBE7 has been a life saver since I just put all my settings in there.  But I did notice the linux thing today when I was fooling around.

@Frank, my 280x's love tc 11200 the best, with 1050/1500, but others have success with 1020-1100 in ratios of 10.  /1500

Start here, litecointalk mining section, specially The Stilt threads. Like this thread (https://litecointalk.org/index.php?topic=12369) which is for 79xx & 280s GPUs. Lot of optimized BIOS there.s.

Is there some work being done on 290x, I guess we will have some clear options in a few months, nothing clear by now for me. 290s are little bitchez, I prefer a lot 280s.

Here is another link... Not sure how helpful it's for your situation: http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/ (http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/)

Vadim

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

Use 7970 editor, they are the same.