How will 2 r9 270x perform on pci 3 x16 and pci 2 x4?

[Kingping987]

The title says topic

[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.

[RyanMacRocks]

Just buy a more powerful single GPU, all you are doing by Crossfiring two budget cards is using more power and adding unnecessary stutter compared to a powerful single GPU.

[Kingping987]

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.

10% of a decrease isn't much, thank you for that information. I am not able to sell my r9 270x to micro center since I bought it a little too late. So I was thinking of keeping it and by another one for crossfire. If I could, I would return it with the second one for a gtx 970. Thank you for your quick response.