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290x Crossfire Question

Question asked by dankofownage on Oct 29, 2015
Latest reply on Oct 30, 2015 by black_zion

I am planning to get 2 R9 290xs and run in CF.

My board has 2 PCI-E 2.0 x16 slots but one 16 lanes and the other has 4.

How much will the secondary card being in the 4 lane slot hurt me in performance?