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    Overclocking the AUO B173ZAN01.1 (4K display) to 64.5Hz

    Discussion in 'Sager and Clevo' started by Mangix, May 17, 2017.

  1. Mangix

    Mangix Notebook Guru

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    Since I found no info anywhere online, this is just a post to show how to do it.

    Reduces the milliseconds per frame by 1.16ms.

    Download CRU: https://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU

    Select your monitor.

    Click add under detailed resolutions.

    Set these parameters:

    Active: 3840 2160
    Front Porch: 16 3
    Sync width: 16 5
    Back Porch: 16 16

    Refresh Rate: 64.500

    In my testing, 64.6Hz is unstable. Have not tested 64.55Hz.

    Also, I have the non-gsync version. No idea if that impacts anything.

    edit: Maybe it's possible to reduce the values further. But then the GPU won't be able to downclock...
     
    Mangix, May 17, 2017
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  2. Mangix

    Mangix Notebook Guru

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    My previous post contains unstable parameters. My new ones are:

    Active: 3840 2160
    Front Porch: 48 3
    Sync width: 32 5
    Back Porch: 80 14

    Refresh Rate: 64.500

    Much more stable.
     
    Mangix, Jun 11, 2017
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  3. Meaker@Sager

    Meaker@Sager Company Representative

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    Not actually bad for a 4k display.
     
    Meaker@Sager, Jun 12, 2017
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  4. skandal

    skandal Notebook Evangelist

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    Thanks for this. Did not knew the Tool, maybe I can overclock my display since the oficial Intel drivers do not allow me to add custom resolutions past the 1920x1080@60Hz default.
     
    skandal, Jun 12, 2017
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  5. Prema

    Prema Your Freedom, Your Choice

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    Nice! :)
    Wondering how it re-acts to g-sync in this state...
    Should be pretty much the maximum throughput the internal display port can handle in current gen models...
     
    Prema, Jun 12, 2017
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  6. Mangix

    Mangix Notebook Guru

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    I don't have a gsync card unfortunately :(.

    Pixel clock is at ~573. There's headroom but the monitor starts getting unstable. Previous unstable timings were around 543.

    At the end of the day, it's around a 1.1 ms reduction per frame so I'll take it.

    @skandal most 1080p displays that I've seen go to 75Hz at least. Last I checked though, CRU doesn't work with Intel GPUs. Alternative is to flash the EDID directly which is a little dangerous ( I bricked a computer by flashing to something else on the i2c bus).
     
    Mangix, Jun 16, 2017
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  7. Mangix

    Mangix Notebook Guru

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    New record: 64.80 Hz. Reconsidered my approach and changed vertical to 1, 1, 3.
     
    Mangix, Jul 21, 2017
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  8. EARNEST

    EARNEST Notebook Consultant

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    Is it really worth "overclocking" the display by just ~5Hz?
     
    EARNEST, Dec 15, 2017
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  9. Mangix

    Mangix Notebook Guru

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    Yes it is. To give an example, going from 120hz to 144hz reduces monitor latency by 1.4ms. but 8.3ms is already so low. With 65hz the difference is more noticeable.
     
    Mangix, Dec 15, 2017
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  10. EARNEST

    EARNEST Notebook Consultant

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    Thanks, mate. How does it affect lifecycle of the display? Shortening drastically? Any effect on colours, brightness?
     
    EARNEST, Dec 15, 2017
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  11. Meaker@Sager

    Meaker@Sager Company Representative

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    Display lifetime should not be impacted as drive levels do not change.
     
    Meaker@Sager, Dec 15, 2017
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