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Author Topic: 3x 6870 Graphics glitches  (Read 1280 times)
minerX
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May 20, 2011, 07:00:10 AM
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More issues! Smiley

I was able to get 3 6870 cards running.   After about 10 seconds the screen starts glitching very heavily.  Horizontal artifacts, then displacement.  And finally the screen gets torn in half and "wraps around itself."   

I've got a 1200 Watt powersupply.
2x dummy plugs. 
2.4 SDK, 11.5 drivers.
Motherboard is asus p6t7 WS supercomputer.
They are not crossfire. 

And they are all 3 at stock OC.

Any help would be greatly appreciated.
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Basiley
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May 20, 2011, 07:23:21 AM
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that can be virtually anything. from broken GPU[from failing fan to broken GPU itself] to overrated PSU[which is more frequent].
diagnose further w/o more input is like cure via phone attempts.
can you post screenshot at least ?
and/or did you tried monitor voltage ? preferably not only by software, but hardware[ie using "multimeter']
minerX
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May 20, 2011, 08:23:22 AM
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that can be virtually anything. from broken GPU[from failing fan to broken GPU itself] to overrated PSU[which is more frequent].
diagnose further w/o more input is like cure via phone attempts.
can you post screenshot at least ?
and/or did you tried monitor voltage ? preferably not only by software, but hardware[ie using "multimeter']

Well.  I think I figured out the problem.  My 6950 profile saved the memory speed to catalyst control center.  So all 3 had OC'ed memory.  I didn't notice because frankly I don't know the stock memory rate on the 6870. 

After I tuned the memory back down (I noticed after doing some trouble shooting), everything seems to be working fine.

I'm getting about 275 mh/s per card at 940.
Basiley
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May 20, 2011, 08:53:51 AM
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cool. glad you turn it down quick enough, cuz usually memory overclocking/overheating was irreversible dammage.
The-miner
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May 20, 2011, 08:57:32 AM
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yeah, you have to watch the clocks on those cards, had myself two of those and had a similar problem a while ago! Upgraded to non reference coolers and it went away.
minerX
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May 20, 2011, 09:09:27 AM
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yeah, you have to watch the clocks on those cards, had myself two of those and had a similar problem a while ago! Upgraded to non reference coolers and it went away.

Nice. I really want to figure a non-case setup so I can get 7 of them running. 
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