DAC Latency?

Discussion in 'Video Cards and Monitors' started by Eduardo96, Mar 24, 2018.

  1. Eduardo96

    Eduardo96 New Member

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    Most video cards, specially older ones, have an integrated RAMDAC that converts the digital signal from the card to an analog one that goes trought the VGA port to me monitor. That is not used in digital monitors. But the DAC has latency, it needs some time to convert from analog signal to digital.
    Can this delay affect the performance of a computer during intense gpu usage? Does this mean that between two exactly equal computers with only a difference in the input of their monitor the digital one will exhibit more performace?
    Usually the RAMDAC frequency is 400mhz.
     
  2. Agent Smith

    Agent Smith Well-Known Member

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    3,090
    If you're referring to DVI, I think that is in fact digital. Even the letter D in DVI means digital. I haven't seen an analog display port since circa 2007.
     
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  3. Eduardo96

    Eduardo96 New Member

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    I see CRT Analog monitors every day. I use a 17'' AOC. Sad.
     
  4. Margrave Brandenburg

    Margrave Brandenburg New Member

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    The DAC latency is too small to detect. No worries.
     
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  5. Jamebonds1

    Jamebonds1 Active Member

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    1,709
    It is only under 40 ms. No big deal unless it is gaming problem for you?
     
  6. Margrave Brandenburg

    Margrave Brandenburg New Member

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    DAC latency is darn near zero. Latency comes from the Windows audio subsystem.

    Latency is not a problem when viewing videos or listening to recorded (or streamed) music.

    It might be a problem with gaming. But it is a BIG problem when performing, and 40 msec is HUGE. Even 20 msec is annoying. Mine is at around 2 msec, which goes unnoticed.

    If you need low latency (on Windows), get the appropriate ASIO driver. It bypasses the Windows audio subsystem and uses its own.
     
  7. Eduardo96

    Eduardo96 New Member

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    I'm not referring to the audio system. I was talking about the latency generated by the Digital to analog Converter (DAC) that most video cards have. That DAC is what converts the digital data from the GPU and output it by the VGA out (to analog monitors). All converters have a conversion time, and that's the latency I mean. That's not a problem in digital displays because the signal is not converted from digital to analog.
     
  8. Margrave Brandenburg

    Margrave Brandenburg New Member

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    Me too. My end-to-end latency (including the DAC) is 2 msec. Mine is an outboard Presonus Audiobox.
     
  9. Eduardo96

    Eduardo96 New Member

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    Man, I'm not talking about latency in audio system. It is different from the one I'm talking about.
     

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