While I don't have these cards, I have noticed the dummy plug requirement seems to vary. I've used Xubuntu / Ubuntu / Debian / BAMT all with varying cards, on recent drivers and cgminer builds, and never had to use a dummy plug for 1 or multi-GPU setups.
I'm thinking it could be a motherboard/bios thing as well as setting in the OS itself.
Situations may vary of course, but this has been my experience. None of the units in my farm have dummy plugs, or anything connected to them at all except an ethernet and power cable.
Topic: Poor Radeon HD6950 Litecoin mining performance, need help [SOLVED] (Read 26487 times)
September 09, 2013, 12:18:03 PM
July 10, 2013, 01:58:52 PM
By the way, did you know that Xubuntu -- or the latest AMD drivers, or CGMINER -- requires a DUMMY PLUG, even in Linux?
Bet you didn't know that!
Bet you didn't know that!
June 12, 2013, 08:41:20 PM
installing 12.11 beta drivers seems to have fixed it
So glad I stumbled across this thread. Same exact thing going on here. I'll try this later and see what the result is.
Hey thanks for your help bro! My 6950 will be on it's way shortly!
June 12, 2013, 07:27:06 PM
installing 12.11 beta drivers seems to have fixed it
So glad I stumbled across this thread. Same exact thing going on here. I'll try this later and see what the result is.
June 12, 2013, 07:05:16 PM
I'h having a poor performance issue as well. I'm on 12.11 beta and have sdk 2.5 installed. When I run CGminer it doesnt even see my 6950. When I run gui miner it seems like there is some sort of speed limiter.. I can hit 400MHs, 450MHs but then no matter what I use it goes back to 350MHs. I have tried 13.1, 12.10 and, 12.11 beta as well as sdk 2.8 and 2.5. I also have a GTX 480 installed if that helps. Any ideas? I'm loosing out on quite a bit 
I am actually about to buy a 6950 on ebay.. Will the 1gig gigabyte model be able to get 450? or will I have to settle for 350?
sry to post on such an old thread but I figure it's relevant cause I don't really even have the money to be buying a 6950 let alone the 200 - 7950's I would love to have!!! So I want to know and haven't been able to find a difference in kh/s between the 1gb and 2gb cards except for in games.. are you guys using 1 or 2 gig cards.. if you're still using 6950's?
March 21, 2013, 09:58:55 PM
I'h having a poor performance issue as well. I'm on 12.11 beta and have sdk 2.5 installed. When I run CGminer it doesnt even see my 6950. When I run gui miner it seems like there is some sort of speed limiter.. I can hit 400MHs, 450MHs but then no matter what I use it goes back to 350MHs. I have tried 13.1, 12.10 and, 12.11 beta as well as sdk 2.8 and 2.5. I also have a GTX 480 installed if that helps. Any ideas? I'm loosing out on quite a bit
December 19, 2012, 01:33:11 PM
With the shaders unlocked (on one card at least) and both cards OC'd to 900/1300. I'm now pulling 900kh/s.
Sweet.
I love happy endings.
Sweet.
I love happy endings.
December 19, 2012, 12:07:41 PM
installing 12.11 beta drivers seems to have fixed it
I'll try this later today and let you know...thanks!
No time to play about with linux for the first time, till the new year
Yup, don't forget to delete all the old binaries for cgminer (.bin files)
I'm using cgminer 2.8.7 and getting 500 kh/s now on my 6970, thread-concurrency 8000
Thanks man, you're a star. This combination has completely fixed my problems. I'm now getting 395kh/s out of both cards before even trying shader unlocking or overclocking.
Brilliant.
http://i1098.photobucket.com/albums/g374/Negcreep69/Capture2_zpsc7568616.jpg
December 19, 2012, 10:44:45 AM
installing 12.11 beta drivers seems to have fixed it
I'll try this later today and let you know...thanks!
No time to play about with linux for the first time, till the new year
Yup, don't forget to delete all the old binaries for cgminer (.bin files)
I'm using cgminer 2.8.7 and getting 500 kh/s now on my 6970, thread-concurrency 8000
December 19, 2012, 06:41:05 AM
installing 12.11 beta drivers seems to have fixed it
I'll try this later today and let you know...thanks!
No time to play about with linux for the first time, till the new year
December 18, 2012, 05:45:12 PM
installing 12.11 beta drivers seems to have fixed it
December 18, 2012, 05:40:48 PM
tbh i'd rather fix the problem, since i doubt i'll be the last person to encounter it.
December 18, 2012, 04:46:00 PM
Amazing, even after 12.10 uninstall and driver sweeper and 12.6 reinstall, everything is still fucked up. I'll keep messing with it I guess.
Use linux? December 18, 2012, 02:42:20 PM
Amazing, even after 12.10 uninstall and driver sweeper and 12.6 reinstall, everything is still fucked up. I'll keep messing with it I guess.
December 18, 2012, 01:16:13 PM
I'm having this problem too now after updating my driver to 12.10. Try 12.6 and 12.8 catalyst drivers.
edit: going back to 12.8 doesn't fix it for me... something is really broken.
edit: going back to 12.8 doesn't fix it for me... something is really broken.
December 18, 2012, 04:54:44 AM
Thanks for your help guys. I will update this thread if I get any difference with Linux. Will take me a couple of weeks to find the time though with the holidays coming up.
December 17, 2012, 03:59:15 PM
FWIW I'm on win7 x64.
Your hardware is fine.
Try using gpu-z to check if your GPU clocks are spooling up all the way.
Your hardware is fine.
Try using gpu-z to check if your GPU clocks are spooling up all the way.
GPUZ indicates overclocking works. But it has little to no effect on my hashrate. Tried 825-950 gpu clock, with voltage increases upto 1.2v. The cards got hotter but it didn't help.
I also tried each card on it's own. Same sub par hashing speeds.
Could it be something to do with the motherboard or ram? I am just reusing old hardware here, didn't really research the best components.
q6600@3ghz
Gigabyte EP45- ES3P
4Gb DDR2
700w PSU
Also, has anyone actually compared hash rates with windows 7 x64 and a linux distro?
Could it be something to do with the motherboard or ram? I am just reusing old hardware here, didn't really research the best components.
q6600@3ghz
Gigabyte EP45- ES3P
4Gb DDR2
700w PSU
Also, has anyone actually compared hash rates with windows 7 x64 and a linux distro?
No have pair of 6970 on DS3R version of that mother board same ram and cpu 750 psu they go @ 425kh/s, never used windows for mining so no way to compare.
Edit: And the second card is on pci-e 1x adapter because the second pci-e 16x slot is dead on it even that does not slow it down both cards get same hash rate.
Yeah that was a typo I have the DS3R too.
PCE slots run at 16x for one card or X8, X8 for 2 cards.
Other than trying Linux (which is going to take a while for me learn), I am really out of ideas. I think I'll just have to settle with what I've got unfortunately. They were ebay cards, £220 for 620kh/s isnt too bad I guess.
Me too though the linux is not that hard to do if you have ever installed an os should be simple to get it on machine and most guides can be pretty much cut'n'pasted into a terminal window to finish what you need done to mine.
December 17, 2012, 02:05:25 PM
FWIW I'm on win7 x64.
Your hardware is fine.
Try using gpu-z to check if your GPU clocks are spooling up all the way.
Your hardware is fine.
Try using gpu-z to check if your GPU clocks are spooling up all the way.
GPUZ indicates overclocking works. But it has little to no effect on my hashrate. Tried 825-950 gpu clock, with voltage increases upto 1.2v. The cards got hotter but it didn't help.
I also tried each card on it's own. Same sub par hashing speeds.
Could it be something to do with the motherboard or ram? I am just reusing old hardware here, didn't really research the best components.
q6600@3ghz
Gigabyte EP45- ES3P
4Gb DDR2
700w PSU
Also, has anyone actually compared hash rates with windows 7 x64 and a linux distro?
Could it be something to do with the motherboard or ram? I am just reusing old hardware here, didn't really research the best components.
q6600@3ghz
Gigabyte EP45- ES3P
4Gb DDR2
700w PSU
Also, has anyone actually compared hash rates with windows 7 x64 and a linux distro?
No have pair of 6970 on DS3R version of that mother board same ram and cpu 750 psu they go @ 425kh/s, never used windows for mining so no way to compare.
Edit: And the second card is on pci-e 1x adapter because the second pci-e 16x slot is dead on it even that does not slow it down both cards get same hash rate.
Yeah that was a typo I have the DS3R too.
PCE slots run at 16x for one card or X8, X8 for 2 cards.
Other than trying Linux (which is going to take a while for me learn), I am really out of ideas. I think I'll just have to settle with what I've got unfortunately. They were ebay cards, £220 for 620kh/s isnt too bad I guess.
December 17, 2012, 10:28:40 AM
I also tried each card on it's own. Same sub par hashing speeds.
Could it be something to do with the motherboard or ram? I am just reusing old hardware here, didn't really research the best components.
q6600@3ghz
Gigabyte EP45- ES3P
4Gb DDR2
700w PSU
Also, has anyone actually compared hash rates with windows 7 x64 and a linux distro?
Could it be something to do with the motherboard or ram? I am just reusing old hardware here, didn't really research the best components.
q6600@3ghz
Gigabyte EP45- ES3P
4Gb DDR2
700w PSU
Also, has anyone actually compared hash rates with windows 7 x64 and a linux distro?
No have pair of 6970 on DS3R version of that mother board same ram and cpu 750 psu they go @ 425kh/s, never used windows for mining so no way to compare.
Edit: And the second card is on pci-e 1x adapter because the second pci-e 16x slot is dead on it even that does not slow it down both cards get same hash rate.
December 17, 2012, 09:24:28 AM
FWIW I'm on win7 x64.
Your hardware is fine.
Try using gpu-z to check if your GPU clocks are spooling up all the way.
Your hardware is fine.
Try using gpu-z to check if your GPU clocks are spooling up all the way.
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