Crossfire PCI 2.0 x16 x4 GIGABYTE GA-970A-UD3 7950 bottleneck

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Oaky180

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Jul 7, 2013
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I have a GIGABYTE GA-970A-UD3 motherboard with a 7950. I want to possibly crossfire with another 7950 but my concern is the second PCI 2.0 slot is only x4.

Now I know that this will probably cause a bottleneck, I just don't know how much of a bottleneck. My biggest question is how much of an improvement will I see over my single 7950 with the second x4 slot? How much less of an improvement would that be over a x16 slot? Would it be worth it? I want at least a 75% improvement, maybe 60%

Thank you for all of your help!
 
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A
I think it is x4 when running 2 cards. I think it is only capable of x16 if you use that slot only. I find the labeling a bit misleading, but I think I recall this to be normal. Sorry for the confusion. I should have reviewed this more carefully before posting. My MB has 3 x16 slots, but when running 2 cards it is 2 X x8 and the third would be x4. That is roughly the same principle! I think Gigabyte should label the selling points with more accuracy. It says 2 x16 slots for great crossfire performance, but leaves out the x4 limitation. It's all in the details, which I failed to read first!
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avjguy2362

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Jun 21, 2012
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Just took a closer look and the label on the MB does show the second slot as X4, interesting! Does the manual say it is only x4. Perhaps a newer revision allows the second slot to be x16 and the MB labeling was not changed!?

Just clicked on the Rev3.0 and it too says 2 PCIs X16, but the MB label is still 4X!!

Sorry...Specs do say second X16 slot running at X4...?
 
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Oaky180

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Jul 7, 2013
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Is there anyway I can check on my computer using a program?
 
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avjguy2362

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Jun 21, 2012
732
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I think it is x4 when running 2 cards. I think it is only capable of x16 if you use that slot only. I find the labeling a bit misleading, but I think I recall this to be normal. Sorry for the confusion. I should have reviewed this more carefully before posting. My MB has 3 x16 slots, but when running 2 cards it is 2 X x8 and the third would be x4. That is roughly the same principle! I think Gigabyte should label the selling points with more accuracy. It says 2 x16 slots for great crossfire performance, but leaves out the x4 limitation. It's all in the details, which I failed to read first!
 
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