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Thread: slow transfer speed on fermi cards

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  1. #1
    Junior Member Regular Contributor
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    slow transfer speed on fermi cards

    I am getting very slow transfer speeds on the newest NVidia cards (GTX470/GTX480). glReadPixels() and texture upload speed is about 55% slower compared to previous generation cards (GTX280/GTX285).

    Tried different drivers, of course... same results.
    The hardware specs predict better results. (less bits memory address bus, but higher memory clocks)

    Can anyone report different results?

  2. #2
    Junior Member Regular Contributor
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    Re: slow transfer speed on fermi cards

    What platform?

  3. #3
    Junior Member Regular Contributor
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    Re: slow transfer speed on fermi cards

    Quote Originally Posted by randall
    What platform?
    Windows XP, drivers 197.x and 257.21.
    Tested on different mainboards, etc.

  4. #4
    Junior Member Newbie
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    Re: slow transfer speed on fermi cards

    I got the same problem. With most Windows OS (XP - Seven 32 and 64 Bit)and NV drivers 197 and 257.

  5. #5
    Senior Member OpenGL Guru Dark Photon's Avatar
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    Re: slow transfer speed on fermi cards

    Quote Originally Posted by RDNXR
    I got the same problem. With most Windows OS (XP - Seven 32 and 64 Bit)and NV drivers 197 and 257.
    Are you seeing this on both your GTX 480 and QuadroFX 5800?

    We should post a short test prog for folks to run and compare readback rates between cards.

  6. #6
    Intern Contributor ruysch's Avatar
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    Re: slow transfer speed on fermi cards

    You guys have to come with something more solid than, "I got a 55% performance drop"; I aint saying its not true, but you aint giving any of us very much to work with.
    Knowledge is Power. Power Corrupts. Study Hard. Be Evil

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