Do 2 HD 7950's need a crossfire bridge?

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Yes, they require a crossfire bridge. Bridgeless crossfire (XDMA) was introduced with the 2nd generation GCN architecture on the Hawaii GPUs (R9-290/R9-290x). I believe that the HD7750 and HD 7770 can use bridgeless crossfire but since these are 1st generation GCN GPUs they will pass through the CPU rather than directly over XDMA.

Other 2nd generation GCN GPUs including the HD7790, R7-260/R7-260x and 3rd generation GCN GPUs are all bridgeless
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Pinhedd

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Aug 7, 2007
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Yes, they require a crossfire bridge. Bridgeless crossfire (XDMA) was introduced with the 2nd generation GCN architecture on the Hawaii GPUs (R9-290/R9-290x). I believe that the HD7750 and HD 7770 can use bridgeless crossfire but since these are 1st generation GCN GPUs they will pass through the CPU rather than directly over XDMA.

Other 2nd generation GCN GPUs including the HD7790, R7-260/R7-260x and 3rd generation GCN GPUs are all bridgeless
 
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photonboy

photonboy

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Jun 20, 2006
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yep
https://en.wikipedia.org/wiki/AMD_CrossFireX#XDMA

but...note this:

"For example, an R9-280X card can be used in a CrossFireX setup together with a HD 7970 card, largely due to them being the same product at different clock rates.[18]"

I don't recommend multi-GPU setups, but it looks like you can buy an R9-280X and pair it with an HD7970 if the motherboards supports XDMA.

(You'd have to buy the card that matches the HD7950 which might be the R9-280 or R9-380)
 
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Pinhedd

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The R9-280/R9-280X is a 1st gen GCN GPU. It requires a bridge
 
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