Problem with CrossfireX

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LqdWiz

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Jul 22, 2014
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Does anyone know why I would get a lower score on 3dmark using 3x HD6970 crossfirex compared to 2x HD6970 crossfire.

3dmark score for x3 HD6970 = 45,982
3dmark score for x2 HD6970 = 111,009

Gaming Rig Specs:
MB Asus Maximus Vii Hero (BIOS v. 1002)
Intel i5 4440 3.1 GHz
Corsair 8gb Vengeance 1600mhz (2x4gb)
Saphire 2gb HD6970 (x3) (Catalyst v. 14.4)

Thanks
Mark
 
Solution
clutchc
I have found that installing a card in a PCIe x16 slot that is only x4 lanes bandwidth (like your 3rd slot is) will most often drag down performance of the cards in the x8 lane or higher slots. This holds true for dual cards, and while I haven't tried it with triple cards, I would suspect the same thing to be the case. Add to that the fact that your 3rd slot shares bandwith with PCIe 2.0 x1 and M.2 slot. (if the latter slots are populated)
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clutchc

clutchc

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Apr 22, 2009
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I have found that installing a card in a PCIe x16 slot that is only x4 lanes bandwidth (like your 3rd slot is) will most often drag down performance of the cards in the x8 lane or higher slots. This holds true for dual cards, and while I haven't tried it with triple cards, I would suspect the same thing to be the case. Add to that the fact that your 3rd slot shares bandwith with PCIe 2.0 x1 and M.2 slot. (if the latter slots are populated)
 
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Solution
L

LqdWiz

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Jul 22, 2014
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4,510
Hey Grandmaster clutch I had a feeling that was the case. As im going to invest in an M.2 SSD in the future I have removed the 3rd card and will save it in case one of the other two die. 3 vid cards is a bit overkill anyways and the air flow is not great either. Thank you very much for the quick reply.
 
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