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Author Topic: Can you mix 69xx and 58xx cards in same rig?  (Read 1032 times)
cvicisso
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June 26, 2011, 02:01:37 AM
 #1

I know this has probably been asked a hundred times already, but there are so many posts now - it's hard to search/find anything (information overload)!

Disregarding overheating/spacing issues... I have 3 x 6950s and want to add a 5850... is it possible from a software perspective?  I thought I remember reading somewhere that you can't mix like that...

I'm running Win 7 (32) and guiminer on an MSI mobo.  I've got PCIe risers on the way...

Thanks.

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xane
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June 26, 2011, 02:43:39 AM
 #2

It will be detected in Windows, but you can't Crossfire across GPU architectures. I couldn't even Crossfire a 6950 with a 6870. Without Crossfire, in order to mine with it you will either need to hook up a 2nd monitor to the card, or use a "dummy plug" as described elsewhere on these forums. If you do that, though, it should work from a mining perspective.

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einsteinx2
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June 26, 2011, 04:44:13 AM
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I'm running Ubuntu Linux and not Windows, but I've got a 6950 and a 5870 in one of my mining rigs and it's working fine. As I understand it, the Linux drivers don't have that "dummy plug" issue, so that may affect you, but other than that it's definitely possible yes.
cvicisso
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June 26, 2011, 04:08:32 PM
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Thanks guys - I'm going to go for it.  The dummy plug issue is easy - I'm not running Crossfire now... I just stuck some cheap resistors in the VGA adapters that come with each (and every) GPU and it works like a charm. 

Thanks again.
Jack of Diamonds
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June 26, 2011, 04:31:04 PM
 #5

Yes you can.
My biggest rig is running a 6990, 5850 and a 5870 all at the same time (total of 4 gpus).

You don't need to crossfire anything & everything will be detected as long as you have enough monitor cables or dummy plugs.

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