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Author Topic: 2 x 6990's - Faulty Core????  (Read 966 times)
doodie
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July 21, 2011, 07:44:53 PM
 #1

Hi Guys,

Some help please...

Running 2 x 6990's in crossfire mode on Win 7 64.

3 cores are running @ about 350mh/s each but have one core that runs @ 125mh/s only.

I have noticed that when running Diablo miner I get 8 CU on the core instead of 24 CU on the other 3.

MSI Afterburner reports the core at 99% capacity but only reaches 55C temp... this surely is not running properly.

I think that it maybe a faulty core but just checking with you guys that you have not come across this before.

Any ideas?Huh

Best

D
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Ryu.Hayabusa
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July 22, 2011, 03:01:18 AM
 #2

Definitely possible.  Try playing some intensive 3d game or running a 3d benchmark such as Unigine Heaven to see if any artifacts appear or the GPU crashes the game/program.

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Neokolzia
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July 22, 2011, 05:10:00 AM
 #3

Run MSI Kombustor its good at picking out artifacts, also Miners aren't fond of Crossfire set up's.

I know mine makes CPU usage, tho I don't need a dummy plug.
bmgjet
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July 22, 2011, 06:00:12 AM
 #4

Also possible its not getting enough power so underclocking its self.

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Neokolzia
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July 22, 2011, 07:09:19 AM
 #5

Post your entire rig setup, that is pretty power hungry so its possible.
organofcorti
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July 22, 2011, 07:37:36 AM
 #6

Also try without crossfire.

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Ryu.Hayabusa
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July 22, 2011, 08:19:08 AM
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MSI Kombuster would mainly be good for checking heat as it uses OpenGL, which generally will not show artifacts or crashes.

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doodie
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July 22, 2011, 10:28:40 AM
 #8

Also possible its not getting enough power so underclocking its self.

Currently running 830/1250 so normal clock position on the cards.

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GPU-Z shots - Check out the shaders and texture fill rate?Huh??

Good Core:
http://img585.imageshack.us/img585/2937/ok6990core.gif

Problem Core:
http://img600.imageshack.us/img600/1500/problem6990core.gif

Check out 8 CU on first core when starting Diablominer..

http://img607.imageshack.us/img607/8104/8cu.jpg

Have tried with and without Crossfire enabled with a dummy plug.... no joy.

Thanks

D
PLaci1982
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July 22, 2011, 10:33:04 AM
 #9

95% chance, that the card are faulty...

Try to put only the faulty card in, and see what the miner/GPU-Z telling you

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