Windows GPU limit?

[Mario2k]

super6

What is your PSU , acording to AMD for  2x6900   1000W shhould be at least  , 1200W  recommended .

[Transisto]

Don't care how efficient the 6990 is !

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


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

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]

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.

[Transisto]

Was the motherboard's delivered power as issue ?

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

[CanaryInTheMine]

Was the motherboard's delivered power as issue ?

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

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