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Author Topic: Building a 6990 Rig - Operating System  (Read 13938 times)
goldcd
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June 13, 2011, 10:38:54 PM
 #41

Just to chip in.
I'm currently running 2x6990 cards.
Bought these with some very old bitcoins I had, so I'm looking at this as a free 'ninja game system' that make make me some money.

Firstly I'm running my two 6990 in crossfire mode under win7-64bit. I believe I might do better turning the crossfire off, but that involves dummy VGA plugs and my first attempt at those didn't work.

Two tips I have to give out to my fellow 2x6990 user:
1) Use MSI afterburner.
At core voltage I can get the Clock up 20 to 850 and reduce the memory clock down to 625. This not only gets the hash rate up a little, but reduces the power consumption down by well over 100W
2) Assign all processes to the same core on your CPU. E.g. Create a .bat file as follows:
"
start /affinity 1 /min poclbm.exe -d0 -w256 -f60 --host=mining.bitcoin.cz --port=8332 --user=?.?--pass=?
start /affinity 1 /min poclbm.exe -d1 -w256 -f0 --host=mining.bitcoin.cz --port=8332 --user=?.? --pass=?
start /affinity 1 /min poclbm.exe -d2 -w256 -f0 --host=mining.bitcoin.cz --port=8332 --user=?.? --pass=?
start /affinity 1 /min poclbm.exe -d3 -w256 -f0 --host=mining.bitcoin.cz --port=8332 --user=?.? --pass=?
Just underclocking the memory and assigning to one core got my power consumption down from over 900W, to just over 700W

I'm not for one moment suggesting this is the 'best' configuration, but it pulls in around 340 a core, which seems reasonably respectable.
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Coma
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June 14, 2011, 02:21:42 AM
 #42

I suggest LinuxCoin all the way.
Free, from pendrive, up and running in minutes.

Then if you want to OC, edit your cards BIOS in 15 minutes.
darkpandora
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June 15, 2011, 01:34:22 AM
 #43

you can use atioverdrivectrl in ubuntu to set your 6990 clock to 1000,150. you get 850 Mhash/s

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Coinbuck @ BTCLot
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June 15, 2011, 01:40:26 AM
 #44

I'm running a 6990 + 2 6950(unlocked) in Ubuntu 10.04 just fine with 11.3....

How did you unlock the 6950? Did you do it in ubuntu or in Windows?

(I have a 5850 I would like to unlock too)

Thanks!

There are overclocking programs out there to unlock the 6950. Afterburner may be one of them (I'm not sure, I don't own a 6950). You can not unlock a 5850 to equal a 5870.

However you can flash a 5850 into a 5870 but it's completly useless since that will not unlock the shaders.

Regards,

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June 21, 2011, 05:09:21 PM
 #45

Just to add some of my small experience with the 6990's using Windows, I set the clocks 920/840 and get just under 400 MH/s per core(just under 800MH/s per card) with fans set at a constant 90% the GPUs get around 70-75c except for GPU2 which is at 81c. I noticed when going lower with mem clock it actually gains heat (1-2 degree's). Also these is a switch near the crossfire port that will turn stock 830/1250 into 880/1250, I used afterburner to get the 920/840. Also something to think about is that you can not under clock memory less than 100mhz of core clocks(you can visually do it but the effectivness is zero and will reset your mem clock back 1250, at least in linux anyway). I did get over 405 MH/s by setting the clocks to 940/840 but didn't want the extra heat or didn't want to increase fan speeds above 90%. The temps are stable and barely move. I used Phoenix Riser with "vectors" "13 aggression" and use the "BFI_INT" as extra flags. I still need to tinker around with the fan speeds to see what effect it has when lowering them, but im happy with 2 x 6990's(I use to have 3 but got too hot under linux) which produces just under 1600 MH/s

ixfinito
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June 21, 2011, 08:41:29 PM
 #46

you can use atioverdrivectrl in ubuntu to set your 6990 clock to 1000,150. you get 850 Mhash/s

Hi Darkpandora,

Can you share with us how you managed to change the memory clock speeds in your 6990? I'm currently stuck at 1250 and nothing I do seems to untangle it. Please help if you can, thanks!

Regards,

Forsythe

"That'll do, pig, that'll do"
ixfinito
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June 21, 2011, 08:46:07 PM
 #47

Just to add some of my small experience with the 6990's using Windows, I set the clocks 920/840 and get just under 400 MH/s per core(just under 800MH/s per card) with fans set at a constant 90% the GPUs get around 70-75c except for GPU2 which is at 81c. I noticed when going lower with mem clock it actually gains heat (1-2 degree's). Also these is a switch near the crossfire port that will turn stock 830/1250 into 880/1250, I used afterburner to get the 920/840. Also something to think about is that you can not under clock memory less than 100mhz of core clocks(you can visually do it but the effectivness is zero and will reset your mem clock back 1250, at least in linux anyway). I did get over 405 MH/s by setting the clocks to 940/840 but didn't want the extra heat or didn't want to increase fan speeds above 90%. The temps are stable and barely move. I used Phoenix Riser with "vectors" "13 aggression" and use the "BFI_INT" as extra flags. I still need to tinker around with the fan speeds to see what effect it has when lowering them, but im happy with 2 x 6990's(I use to have 3 but got too hot under linux) which produces just under 1600 MH/s

Hey dude, nice workaround, I'm having trouble with my 3x6990's temperatures. I have one question, you mention that underclocking more than 100mhz of core clocks will default to 1250, so how did you manage to get to 840 in linux? or did you end up using windows and afterburner for good? thanks!

"That'll do, pig, that'll do"
nebiki
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June 21, 2011, 09:37:57 PM
 #48

Just to add some of my small experience with the 6990's using Windows, I set the clocks 920/840 and get just under 400 MH/s per core(just under 800MH/s per card) with fans set at a constant 90% the GPUs get around 70-75c except for GPU2 which is at 81c. I noticed when going lower with mem clock it actually gains heat (1-2 degree's). Also these is a switch near the crossfire port that will turn stock 830/1250 into 880/1250, I used afterburner to get the 920/840. Also something to think about is that you can not under clock memory less than 100mhz of core clocks(you can visually do it but the effectivness is zero and will reset your mem clock back 1250, at least in linux anyway). I did get over 405 MH/s by setting the clocks to 940/840 but didn't want the extra heat or didn't want to increase fan speeds above 90%. The temps are stable and barely move. I used Phoenix Riser with "vectors" "13 aggression" and use the "BFI_INT" as extra flags. I still need to tinker around with the fan speeds to see what effect it has when lowering them, but im happy with 2 x 6990's(I use to have 3 but got too hot under linux) which produces just under 1600 MH/s

Hey dude, nice workaround, I'm having trouble with my 3x6990's temperatures. I have one question, you mention that underclocking more than 100mhz of core clocks will default to 1250, so how did you manage to get to 840 in linux? or did you end up using windows and afterburner for good? thanks!

edit: anyhow, thanks for the input. maybe 6950s are the same, because i can't get my memory clock down. gonna try going for coreclock-100MHz now.

edit²: nope, i can't underclock my memory.

1DWttUPMiDL1ou64SoUriZ29bxdoChjPns
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June 22, 2011, 06:38:19 AM
 #49

Just to add some of my small experience with the 6990's using Windows, I set the clocks 920/840 and get just under 400 MH/s per core(just under 800MH/s per card) with fans set at a constant 90% the GPUs get around 70-75c except for GPU2 which is at 81c. I noticed when going lower with mem clock it actually gains heat (1-2 degree's). Also these is a switch near the crossfire port that will turn stock 830/1250 into 880/1250, I used afterburner to get the 920/840. Also something to think about is that you can not under clock memory less than 100mhz of core clocks(you can visually do it but the effectivness is zero and will reset your mem clock back 1250, at least in linux anyway). I did get over 405 MH/s by setting the clocks to 940/840 but didn't want the extra heat or didn't want to increase fan speeds above 90%. The temps are stable and barely move. I used Phoenix Riser with "vectors" "13 aggression" and use the "BFI_INT" as extra flags. I still need to tinker around with the fan speeds to see what effect it has when lowering them, but im happy with 2 x 6990's(I use to have 3 but got too hot under linux) which produces just under 1600 MH/s

Hey dude, nice workaround, I'm having trouble with my 3x6990's temperatures. I have one question, you mention that underclocking more than 100mhz of core clocks will default to 1250, so how did you manage to get to 840 in linux? or did you end up using windows and afterburner for good? thanks!

When I said that I meant memory clock can not be more than 100mhz below core clock... for example I upped my core clock to 940 meaning that the lowest I can go on mem clock is 840, If I how ever had 960 core clock and 840 mem clock, the mem clock will default back to 1250 due to being 110mhz below core clock. Yeah my 3 6990's got hot very hot so I removed 1 and run with 2 on windows using afterburn, windows structure only allows 4 instances of the driver to be loaded at the same time, something do with opencl, So no good for 3 x 6990(6 GPU's). If anyone does get 3 cards running at a decent hash rate(2000 MH/s + ) and keep the cards cool, then I will go back to linux, until then Im happy with 2 cards running at 1600 MH/s

liuk03
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June 28, 2011, 08:07:28 PM
 #50

Just to chip in.
I'm currently running 2x6990 cards.
Bought these with some very old bitcoins I had, so I'm looking at this as a free 'ninja game system' that make make me some money.

Firstly I'm running my two 6990 in crossfire mode under win7-64bit. I believe I might do better turning the crossfire off, but that involves dummy VGA plugs and my first attempt at those didn't work.

Two tips I have to give out to my fellow 2x6990 user:
1) Use MSI afterburner.
At core voltage I can get the Clock up 20 to 850 and reduce the memory clock down to 625. This not only gets the hash rate up a little, but reduces the power consumption down by well over 100W
2) Assign all processes to the same core on your CPU. E.g. Create a .bat file as follows:
"
start /affinity 1 /min poclbm.exe -d0 -w256 -f60 --host=mining.bitcoin.cz --port=8332 --user=?.?--pass=?
start /affinity 1 /min poclbm.exe -d1 -w256 -f0 --host=mining.bitcoin.cz --port=8332 --user=?.? --pass=?
start /affinity 1 /min poclbm.exe -d2 -w256 -f0 --host=mining.bitcoin.cz --port=8332 --user=?.? --pass=?
start /affinity 1 /min poclbm.exe -d3 -w256 -f0 --host=mining.bitcoin.cz --port=8332 --user=?.? --pass=?
Just underclocking the memory and assigning to one core got my power consumption down from over 900W, to just over 700W

I'm not for one moment suggesting this is the 'best' configuration, but it pulls in around 340 a core, which seems reasonably respectable.

hi goldcd, i have the same setting, 2x6990 on w7 and i overclock with MSIafterburner at 900MHz but when i try to underclock the memory 779MHz is the lower value that i can set, if i try to set 625MHz the memory clock go in the default valute 1250MHz, why i can't put 625?
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