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April 20, 2014, 11:51:42 am

Author Topic: Sapphire 7950 21196-00-20GHD  (Read 770 times)

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Offline BitJohn

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Sapphire 7950 21196-00-20GHD
« on: May 10, 2013, 04:18:06 pm »
Quote
color 02
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
timeout 30
cgminer --scrypt  --gpu-engine 1072 --gpu-memclock 1650 --intensity 20 --thread-concurrency 24000 --gpu-powertune 20 --worksize 256 --gpu-fan 65

So I use the above for my Sapphire 7950 21196-00-20GHD config and I am getting 595Khs from it I have seen of guys getting more but this is all she manages at the moment any suggestions?

I tried undervolting it with cgminer but it just stays at 1.250v??????


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Offline JesstersDead

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Re: Sapphire 7950 21196-00-20GHD
« Reply #1 on: May 10, 2013, 04:26:09 pm »
For the voltage issue, download MSI Afterburner, and under settings click the box that says "Unlock Voltage Control". Not all cards can be vddc adjusted by default.

Also, 595 isn't bad. I have 4x Sapphire 7950 4L's and seem to cap out at 595 myself. I also have 16 PowerColor 7950's that push 620 KH/S with the exact same settings. The Sapphires (mine are reference blow fan designs, which if I am not mistaken yours are as well) run significantly cooler that the PowerColors at the same clocks/cddv, etc. 10C cooler at 90% Fan actually. So 595 really isn't that bad when all is said and done.


Offline BitJohn

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Re: Sapphire 7950 21196-00-20GHD
« Reply #2 on: May 10, 2013, 04:27:48 pm »
That makes me pretty happy squeaked out the last 50Khs in the last day or so. Ill have to toy with voltage now. Thanks a bunch!
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Offline JesstersDead

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Re: Sapphire 7950 21196-00-20GHD
« Reply #3 on: May 10, 2013, 04:35:02 pm »
No problem at all man. For a reference point, all my 7950's are @ vddc 1050mv, and I adjust powertune in Afterburner on an as needed basis for heat and stability. I have one rig that runs balls to the wall 2.5 MH/S with +20 powertune and none of the cards break 75C, while another rig in the same room will meander up in to the 80's with powertune over +15. I have found that a minimum powertune of +10 keeps the drivers from crashing due to power issues though, so none of my rigs run lower settings than that. If the drivers crash they will often reset vddc to stock settings and cause thermals to spike rather rapidly.

Offline BitJohn

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Re: Sapphire 7950 21196-00-20GHD
« Reply #4 on: May 10, 2013, 04:38:04 pm »
So most of your configs are just powertune 10? Is there a disadvantage to doing 20? I guess I don't understand exactly what it is powertune does.
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Offline JesstersDead

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Re: Sapphire 7950 21196-00-20GHD
« Reply #5 on: May 10, 2013, 04:42:36 pm »
Powertune allows the gpu to draw that percentage voltage over what vddc is set to. It can greatly increase heat, but also allows for a vdroop buffer when undervolting, and thus more stability. I will say you get the very best performance with a higher pt setting, but not necessarily the best thermals nor power consumption. My rigs run 24/7 gpu ming LTC and cpu mining YAC atm, and pull a total of 7.8 amps each from a 120v circuit.