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Author Topic: MSI 990FXA-GD65 & 2xHD5850 + HD7970 problem  (Read 2206 times)
Bunny84
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May 24, 2013, 06:57:46 AM
 #1

Hello,

I've got a following rig:
MSI 990FXA-GD65
Sempron 145
2GB DDR3
40GB HDD
2xHD5850 reference (Gigabyte & Sapphire)
HD7970 reference (MSI)
3 risers 1/16.
Windows 7 x64
Catalyst 13.1

I can only use these slots because I have my cards fastened to my case and my risers work only if they aren't bent too much.

I've got a problem. When I have 2 cards of the same (HD5850) my Windows starts without problems and I can use cgminer, Afterburner etc. When I mix 1 of those HD5850 with HD7970, then it also works. When I have all of them, then after UEFI proceeds to looking for OSes on all mass storages, a black screen appears (with a green indicator on a monitor, so the graphic card passes video to it). My hard drive is fairly loud so I could hear if it would have been loading OS with a black screen. It is just stuck. The same happens when I try to boot from Windows 7 install CD. A prompt 'Press any key to proceed' appears, and when I press any key it gets stuck. But when I start from Linux LiveCD and I type 'lspci' into console, I can see all of those cards detected. Any help will be appreciated.

Best regards

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May 24, 2013, 06:59:53 AM
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Have you tried swapping around the order of the cards? Maybe have the 7970 as your main GPU and the 5850's as your backup/secondaries (with no CFX enabled)?
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May 24, 2013, 08:41:38 AM
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Yeah, you need to use the HD7xxx card in the primary slot (on my SABERTOOTH 990FX that's the bottom x16 slot for some reason).  I run a HD7950 in the bottom slot, HD6970 in the next up, then the HD5870 in the top slot.  Works 100% for me.


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