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How to enable multi gpu?

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I try to mix my rx480 with r9 280x, but i cant find where I can enable my multi gpu or crossfire ( my seccond card stays at 0% activity ) And yes i reinstalled my drivers.
Thankss
 
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Won't happen even in DX12 I guess. Sell the R9 280X till it hasn't kicked the bucket.
 
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Crossfire doesn't like dissimilar cards.

You can multigpu using a DirectX12 game that supports it, which is basically AoTS, and that's all.
 

AlienIsGOD

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You will need another Rx 480 for crossfire to work. Or another 280x
 
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