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Thread: PCI-E 2.0 or will a 1.xx mobo do?

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    PCI-E 2.0 or will a 1.xx mobo do?

    Hi,

    I'm looking at buying a cheap second hand mobo for a rig I'm building and was thinking of an Asus P5K-E. The only problem I can see is that this board is PCI-E 1.xx whereas the graphics card for this build is a HD4870, which is PCI-E 2.0.

    Now, I've read some old threads about how there are hardly any cards that need the bandwidth available from PCI-E 2.0. But like I say, they were old threads.

    Would my HD 4870 benefit from much from PCI-E 2.0 or would there be no difference from a PCI-E 1.xx mobo?

    Cheers

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    Re: PCI-E 2.0 or will a 1.xx mobo do?

    Bandwidth:

    16x PCIe 1.1: 4GB/s
    16x PCIe 2.0: 8GB/s

    As 4870 has at max 3.6GB/s bandwidth it can be safe to assume that there won't be any difference. However if you get a 4870X2 card or crossfire the two then there is likely to be some performance loss.

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    Re: PCI-E 2.0 or will a 1.xx mobo do?

    This article will be of use to you:

    http://www.techpowerup.com/reviews/A...press_Scaling/


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    Re: PCI-E 2.0 or will a 1.xx mobo do?

    16x PCI-E 1.1 is essentially a 8x PCI-E 2.0 lane so like CTV posted, even with an 5870, the overall performance loss is only about 1%-2% oddly enough. Sounds too good to be true to me. Maybe I read something wrong.

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    Re: PCI-E 2.0 or will a 1.xx mobo do?

    My 975X based motherboard has its PCI-E slots permanently at 8X electrical even though they are 16X physical slots!!

    OTH,an HD3870,HD4830 and 8800GTS 512MB don't seem to have been affected in performance IMHO.
    Last edited by CAT-THE-FIFTH; 25-11-2009 at 08:15 PM.


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    Re: PCI-E 2.0 or will a 1.xx mobo do?

    Thanks! Just the info I was after


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    Re: PCI-E 2.0 or will a 1.xx mobo do?

    Quote Originally Posted by jonny440 View Post
    Hi,

    I'm looking at buying a cheap second hand mobo for a rig I'm building and was thinking of an Asus P5K-E. The only problem I can see is that this board is PCI-E 1.xx whereas the graphics card for this build is a HD4870, which is PCI-E 2.0.

    Now, I've read some old threads about how there are hardly any cards that need the bandwidth available from PCI-E 2.0. But like I say, they were old threads.

    Would my HD 4870 benefit from much from PCI-E 2.0 or would there be no difference from a PCI-E 1.xx mobo?

    Cheers
    I have a P5k-E Wifi/AP and a 4870 1GB. If my PCIe 1.1 is holding anything back I'm yet to notice
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    Re: PCI-E 2.0 or will a 1.xx mobo do?

    Yep no issue, with would be more of an issue with a dual gpu crad but still not a great deal of performance loss.

    p35 (so pci-e x16 1.1) and 9800gtx no issues here

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