Question on pci-e 3.0

Hello,

i want to buy the gigabyte 990fx ud7 which only supports pci-e 2.1.
i know that the performance difference between 2.0 and 3.0 is very little,

but in a single video card config: is pci-e 2.0 x16 better than pci-e 3.0 x8 ?

do you think the upcoming nvidia gtx 700 series will have proprely implemanted the pci-e 3.0 interface enough that it is actually worth buying pcie 3.0 mobo?

i'd like to know how pci-e 2.0 performs against pci-e 3.0 in a single video card config.

if you guys can please enlighten me, it would be greatly appreciated :)

thanks
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  1. hello, well ive heard that pcie 3.0 doubles the tranfer rate of pcie 2.0, a MOBO that dont support 3.0 will limit the video card, as well the processor must support this feature, so imagine u get a pcie 3.0 video card and install it into your MOBO it will run good enought but it wont max, i think im in the correct, right now the recommendable MOBO and processors are from intel, they support this feature Z77 chipset and ivy bridge processors too, but of you have a MOBO then pick the pcie 3.0 card cause no one knows maybe in a while you change your mobo and processor and you will have the video card with you you see.

    well pcie 2.0x16 and pcie 3.0x8, it wouldnt be almost the same i mean if 3.0 doubles the transfer rate 3.0x8 would be like the x16 on pcie 2.0, but right now im not sure my friend.

    ive understood that in pcie 2.0 a lane is 500MBPS so 16x lane is 8GBPS vs pcie 3.0 a lane is 985MBPS 16x 15760MBPS,
    it would be almost the same in the question u asked, 2.0x16vs3.0x8.

    i think its recommendable to get a pcie 3.0 mobo, you can get the full performance the video card can bring and dont forget that the processor has to support it as well, oh i checked and yes nvidia 700 series will feature pcie 3.0

    i hope i can help you with this, have a nice day :)
  2. That's true only from theoretical point of view.
    In practice PCI-E 1.1 x16 and PCI-E 3.0 x16 perform almost the same:
    http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/15.html

    For dual GTX690 or 7990 PCIE 3.0 could make a difference, but for a single GPU card, lack of 3.0 support is not to be worried about.
  3. Bejusek said:
    That's true only from theoretical point of view.
    In practice PCI-E 1.1 x16 and PCI-E 3.0 x16 perform almost the same:
    http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/15.html

    For dual GTX690 or 7990 PCIE 3.0 could make a difference, but for a single GPU card, lack of 3.0 support is not to be worried about.


    nice comparisson chart
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