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PCI Express 2 0 x16 & x4, Will this bog down my performance with two cards?

Hello, I'm building a new PC and I was wanting to know, If I get an ASUS MoBo with a PCI Express 2.0 x16 and a PCI Express 2.0 x4 and a put a HD Radeon 7770 in each, will the x4 bog my performance to where I wont see the difference between having 1 card and two cards? Will the x4 hold the x16 back from performing as well, or will I still see extra performance from having two cards? Thanks for any answers in advance.
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  1. Yes, you will get the better performance from CF HD7770. I add the link for the review, but they use the MB that has the PCIe X8/X8. And your MB only has the PCIe X8/X4 in CF that will hold back the performance.

    If you want to CF then you are better find the MB has PCIe X8/X8 at least.

    CF HD7770 review http://www.bjorn3d.com/2012/03/gigabyte-hd-7770-oc-with-crossfire/
  2. Best answer
    Typically a PCIE 2.0 4x slot will have about a 5% reduction in FPS from a 16x slot.

    Having personally ran a 7770 CF setup @ 16X/4X, 8X/8X and 16X/8X, there was little to no difference in performance, maybe 5% on average with about 10% being the worst between the fastest and slowest.

    Toms did a test on 16X/8X, 8X/8X and 16X/4X. Note that they tested with 6950's. They are much faster and will take more of a hit than a pair of 7770's.

    http://www.tomshardware.com/reviews/pci-express-scaling-p67-chipset-gaming-performance,2887-10.html
  3. Thanks a lot guys, appreciate the help and answers.
  4. Best answer selected by xThe0therGuyx.
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