Nvidia Optimus reduces gaming performance

Discussion in 'Gaming (Software and Graphics Cards)' started by yrekabakery, May 8, 2019.

  1. Viares Strake

    Viares Strake Notebook Guru

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    Precisely why I am looking at the Asus models. They have a toggle to disable optimus and use only the dGPU.
     
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  2. Orangeclock89

    Orangeclock89 Notebook Enthusiast

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    I have a MSI GS65 w/ 2060RTX, this notebooks have Optimus and not GSYNC. But what happen if I use a external monitor via Mini Display Port? Can I use GSYNC in a compatible monitor?

    I will have the performance boost due to iGPU are off? With the integrated display iGPU are always ON, but with external monitor?
     
  3. TheQuentincc

    TheQuentincc Notebook Consultant

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    I also reported different GPU performance on my M6700 when I was running dual internal lcd, one was a LVDS 1080p panel controlled by the intel HD4000 and the other one was an eDP 4k panel controlled by the P4000, so it's basically one an hybrid setup where one of the lcd is affected by "optimus", I didn't measure the performance gap but it was clear in Unigine superposition benchmark
     
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  4. AnotherNotRandomUser

    AnotherNotRandomUser Notebook Enthusiast

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    yrekabakery, hmscott and 0lok like this.
  5. win32asmguy

    win32asmguy Moderator Moderator

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    Performance is almost exactly the same on the Precision 7740 with Quadro RTX 4000 Optimus vs. Dedicated:

    https://www.3dmark.com/compare/spy/8967012/spy/8966960

    Definitely get a second stick of ram. The iGPU uses system ram for the framebuffer so it likely limits high framerates unless you have dual channel.
     
  6. yrekabakery

    yrekabakery Notebook Virtuoso

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    Second everyone else's suggestion about getting another stick of RAM for dual channel and doing the comparison again.

    Synthetic benchmarks like Time Spy already run at very low frame rates (ergo low PCIe bus utilization) and low CPU utilization, so they don't show Optimus bottlenecks like real games running at high frame rates do.
     
  7. Kevin

    Kevin Egregious

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    I just don't know if this is universal. For example in all of the testing I can find the GT76 performs on the level with the Area 51M and the high-end desktop CPU Clevo machines.
     
  8. yrekabakery

    yrekabakery Notebook Virtuoso

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    Do you happen to know what those tests were?
     
  9. kingofswag187

    kingofswag187 Notebook Deity

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    I've seen a 9980HK ROG Mothership outperform a 9900K A51m.
     
  10. yrekabakery

    yrekabakery Notebook Virtuoso

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    As it should, since it has better cooling and can support memory faster than 2400MHz. It supports both G-Sync/discrete-only and Optimus via a mux switch.
     
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