Can Half-Refresh V-Sync even work on monitors with odd-numbered refresh Rates? Thanks!

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by BlindBison, May 6, 2021.

  1. BlindBison

    BlindBison Master Guru

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    For example, if I have a 165 hz monitor and want to use half refresh Vsync on it — is that even possible since the panel hz is odd numbered or does it simply cap to 82.5?

    You could do third refresh Vsync and cap at 55, just something I’m wondering about since usually screens have an even numbered refresh (144 hz for example going to 72, etc).

    thanks!
     
  2. BlindBison

    BlindBison Master Guru

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    @RealNC sorry to trouble you, but have you ever tried this before? I’m wondering how it would behave in conjunction with half refresh Vsync. Thanks!
     
  3. slimmy427

    slimmy427 Active Member

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    Its my understanding that most monitors are not to the zero decimal. For example, my monitor operates at 155.011 hz, 144.006, 119.998, 99.946 and 59.951.
     
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  4. BlindBison

    BlindBison Master Guru

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    Ah, cool thanks -- so half refresh v-sync "should" work fine for 165 HZ, it'll just be outputting 82.5. Have I got that right? Thanks!
     

  5. RealNC

    RealNC Ancient Guru

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    Don't think about refresh rate. It's just a compound unit (one unit divided by another, in this case periods divided by time.) You should think of just time instead. Half vsync 144Hz means a new frame every 13.9ms, while half vsync 165Hz means one frame every 12.1ms. There is nothing special about 13.9ms or 12.1ms.
     
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  6. BlindBison

    BlindBison Master Guru

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    Thanks, that's helpful!
     
  7. Shadowdane

    Shadowdane Maha Guru

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    Yes half-vsync would work at any refresh rate. It doesn't actually cut the LCD's refresh rate in half, it just performs the render at every other refresh but keeps the monitor running at 165Hz.
    Normally that would be a frame rendered at 6.06ms intervals for 165Hz, with half-vsync it would be 12.12ms instead.
     
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