How will Ampere scale on laptops?

Discussion in 'Gaming (Software and Graphics Cards)' started by Kunal Shrivastava, Sep 6, 2020.

  1. Clamibot

    Clamibot Notebook Evangelist

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    The main reason power consumption and frequency don't scale 1:1 is because the voltage required to sustain a given frequency increases at an exponential rate.

    The formula for power consumption of a CPU is p = CV^2f, where p is the power in joules, C is the load capacitance, V is the voltage, and f is the frequency.

    There are other factors that contribute to increasing power consumption at a more than linear rate. Since more power is required to run at higher frequencies, that generates more heat, and heat increases electrical resistance. Then there's power leakage at the transistor level.

    There's probably more factors, and they all add up to increasing the power consumption at more than a linear rate relative to frequency.
     
  2. etern4l

    etern4l Notebook Deity

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    There will always be some red herring examples of two different graphics cards yielding about the same performance - it just means that the given use case cannot utilise the faster hardware well. The 67% is what matters. 60% power and 67% performance is close to linear scaling. So with RTX 3080 mobile at 210W / 65% of max power there are few reasons to believe a miracle will happen and it will provide 90 or 97% of full desktop card performance in relevant applications, i. e. ones that can fully utilise the faster hardware. Yes, the performance gap will probably be smaller in non-RT games. Would just wait/look for some TimeSpy benchmark results at different power limits for a more reliable guess on that.
     
    Last edited: Sep 16, 2020 at 4:00 AM
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  3. BrightSmith

    BrightSmith Notebook Evangelist

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    There's always the possibility that 1080p remains the standard for gaming on laptops for a while longer (or finally 2K) because of its screen size, so they can afford to gimp mobile GPUs.
     
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  4. Kunal Shrivastava

    Kunal Shrivastava Notebook Enthusiast

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    CPU bottlenecks will be even more obvious at that resolution.
     
  5. BrightSmith

    BrightSmith Notebook Evangelist

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    Precisely, which lowers the incentive even more to upgrade from 2080 to a 3080 if you're gaming at 1080p on your laptop.
     
  6. etern4l

    etern4l Notebook Deity

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    Guys, is this a wishful thinking RTX 20 series owner's club? Which modern games running at 1080p and Ultra settings are bottlenecked by the CPU?
     
  7. Kunal Shrivastava

    Kunal Shrivastava Notebook Enthusiast

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    Battlefield 5 on anything lower than i7 8700.
     
  8. etern4l

    etern4l Notebook Deity

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    Anything lower than i7-8700 is not really an option in reasonable gaming laptops.
     
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  9. yrekabakery

    yrekabakery Notebook Virtuoso

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    FS2020, Crysis Remastered, Ubisoft open-world games (WD2, AC Origins/Odyssey, FC5), KCD.
     
  10. etern4l

    etern4l Notebook Deity

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    Well done digging up some examples, but it's not clear if Crysis Remastered qualifies as a modern game.

    https://www.dsogaming.com/pc-perfor...eaded-cpu-issues-just-like-the-original-game/

    There will always be some games which are classed as "bottlenecked by the CPU", but in many, if not all, cases (as with Crysis) this will just be a case of a legacy engine incapable of utilising modern multicore CPUs. A true bottleneck would entail the game running a modern 6 core + CPU at full power.
     
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