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Author Topic: Multiple GPU setup, poclbm not seeing device 1 and 2  (Read 3668 times)
chungenhung
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May 04, 2011, 02:24:31 AM
 #1

Win7 x64, 11.4 driver.
Got 3 5850 card installed. Ran phoenix1.4 with poclbm kernel.
It only sees device 0.

I opened up GPU-Z, MSI AfterBurner, and Windows Device Manager, all showing I have 3 graphics cards.
AMD Vision control shows I have 9 available video outputs, which is correct, 3 for each card, total of 9.

What is the problem here?
Must CrossfireX be enabled? What if my board doesn't support CrossfireX? it is a old 790FX chipset board.
Also, I have 3 cards, each with only one Crossfire connector on top, how could I possibly connect all three together?
Yes, my 5850 has only one Crossfire connector on the top.

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May 04, 2011, 03:56:50 AM
 #2

On Windows you need a monitor attached to every card in the system that you want to use for OpenCL.

The alternative is to make "dummy plugs" which trick the cards into thinking a monitor is present.

Info:
http://www.overclock.net/folding-home-guides-tutorials/384733-30-second-dummy-plug.html

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