How will 2 r9 270x perform on pci 3 x16 and pci 2 x4?
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Solved by Morgan MLGman,
PCI gen. 2 x4 can decrease performance by around 10% average, sometimes a bit more, sometimes a bit less. But it does bottleneck a card. The faster card is going to slow down to match the speed of the bottlenecked one. That's how it would look most likely.
Why would you crossfire such low-end cards? Sell those and get a single, more powerful card like the 390 for instance.
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