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Author Topic: [SOLVED] 3rd GPU problems  (Read 703 times)
ahitman
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August 17, 2011, 11:07:50 PM
 #1

I have a GA-870A-USB3 motherboard which has 4 PCIe slots on it (2 16x and 2 1x) I currently have 2 5850's running perfectly in the two 16x slots. I am trying to add another 5850 using a 1x PCIe extender cable (riser?) but I cannot get it to work. When I take out the two other cards and only connect the new card to any of the the 1x slots, the card is not recognized by the graphical part of debian (running linuxcoin 0.2b) but the bios shows up and I can see linux loading. I then get a Failed to start X server message. I am using a modified 1x PCIe cable (I took of the end to fit onto the 16 connector on the card).

Has anyone else had this problem? What can I try to fix this? Thanks.

Also the same thing happens if the other two cards are left in the mother board, and the new card works fine if connected directly into the mother board.
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mikeo
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August 17, 2011, 11:14:05 PM
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You might try a PCIe powered x1--->x16 extender cable w/molex.

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ahitman
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August 17, 2011, 11:53:22 PM
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But wouldn't the video card do the full speed fan thing if it wasn't getting enough power at start up?
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August 18, 2011, 12:04:31 AM
 #4

The stanzas in your Xorg.conf are more or less device-specific.

I don't use linuxcoin and don't know it's internals, but in Ubuntu you can just run:

sudo DISPLAY=:0 aticonfig --initial -f --adapter=all

If linuxcoin's sudo isn't setup / gives you an error, become root and run it directly without the sudo.

Team Epic!

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ahitman
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August 18, 2011, 03:41:39 AM
 #5

Thanks, that seems to have helped as now I can run one old card and the new card together directly into the motherboard, but for some reason the extra power supply got doesn't want to turn on any more )just makes a quiet clicking sound when i short green and black but the fan does not turn on at all) so I have to get a new one tomorrow to try all three at the same time.

Thanks again!
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August 18, 2011, 10:45:00 PM
 #6

Thanks! I installed the card, added the second power supply, and booted up ran the command, then on reboot everthing worked as expected.

Thanks Again!
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