How do you turn off dgpu with Optimus?

Discussion in 'Videocards - NVIDIA GeForce' started by link626, Sep 6, 2012.

  1. link626

    link626 Member

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    GPU:
    amd 6650m, nvda gtx660m
    I have lenovo y580 with gtx660m optimus.

    gpu-z says my dgpu is running at 135/202 clocks during idle. sometimes it spikes to 835/1250 for no reason during idle.

    It appears that it is still running during idle.

    I have set default behavior in nvidia control panel to use the intel igp, but dgpu still runs.

    I want to turn it off during idle/low load without using the bios. How ?
     
  2. xIcarus

    xIcarus Master Guru

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    1080 Ti AORUS
    you cannot 'turn off' a gpu that easily. if the clocks spike, it doesn't necessarily mean that the gpu is used 100%. optimus activates the discrete gpu using system calls only when it's needed.

    why do you need to turn off the discrete gpu anyway? as long as there's almost no load on it, the power consumption will be negligible. the operating frequency really doesn't matter as much as most people think.
     
  3. link626

    link626 Member

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    GPU:
    amd 6650m, nvda gtx660m
    i just thought it was supposed to behave like AMD dual graphics.

    my asus other laptop also has dual graphics, and shuts down the dgpu completely when not in use. the 6650m reads at 0mhz.

    so it's designed to not completely shut off? always on in low power state?
     
    Last edited: Sep 6, 2012
  4. Rooobko

    Rooobko New Member

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    GPU:
    Geforce 540m/Intel HD3000
    I have 540m with HD3000 and nvidia is constantly running on 203/405mhz, sometimes it jumps up to ~600/1000.. so I think its normal..
     

  5. link626

    link626 Member

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  6. sykozis

    sykozis Ancient Guru

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    That guide is more than 2 years old. Try reading the updated whitepaper...

    Source: http://www.nvidia.com/object/LO_optimus_whitepapers.html page 11
     
  7. link626

    link626 Member

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    GPU:
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    nvidia tech support just explained this issue to me.

    gpuz makes a call to the dgpu.

    that's why it's turned on.

    if i close gpuz, hwinfo64 does not detect the dgpu anymore.

    dgpu is in fact fully disabled. :banana:
     
    Last edited: Sep 7, 2012
  8. xIcarus

    xIcarus Master Guru

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    that's very odd, as far as I know the gpu enters a suspend state, it's not actually powering off.
     

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