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Mario2k
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June 11, 2011, 12:35:21 PM
 #21
super6

What is your PSU , acording to AMD for  2x6900   1000W shhould be at least  , 1200W  recommended .
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Transisto
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June 30, 2011, 02:17:47 AM
 #22
Don't care how efficient the 6990 is !

There is no answer to "Windows GPU limit ?" in this thread yet,,,


...


Edit: Here is our answer,,, : http://forum.bitcoin.org/index.php?topic=17949.0

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XP support at least 4GPUs
7 supports at least 8GPUs, but only 4 can run OpenCL.

With the new 10.6 drivers, the limit on Windows is now 8 OpenCL
CanaryInTheMine
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June 30, 2011, 02:28:24 AM
 #23
I can confirm testing 8 GPUs (4 6990s) on Win7 64-bit without an issue using 11.6 drivers.  The issue you WILL have is insane heat with 6990s.

Almost have that solved with 450 CFM fan panel. Smiley
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June 30, 2011, 02:46:05 AM
 #24
Was the motherboard's delivered power as issue ?

Note : I'm going for 5 using extenders on an old ep43-ds3l Smiley
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June 30, 2011, 02:55:16 AM
 #25
Quote from: Transisto on June 30, 2011, 02:46:05 AM
Was the motherboard's delivered power as issue ?

Note : I'm going for 5 using extenders on an old ep43-ds3l Smiley

You might be OK with extenders since the power is not drawn from mobo.  You'll have to test... You might have issues though with an older board.

I tested using 890FXA-GD70
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