Does switching between iGPU & dGPU cost energy?

Discussion in 'MacBook Pro' started by Blackvibes, Nov 24, 2016.

  1. Blackvibes macrumors member

    Joined:
    Oct 30, 2014
    #1
    Just like powering on the engine again, which costs fuel, does it cost any energy (above the default usage) to switch between the iGPU and dGPU?

    I just installed gfxCardStatus which shows a notification when my MBP 15" '16 toggles between the Intel chip and the AMD chip. But this happens very often.

    So I wonder whether the jump, even for half a second, costs any energy? Hereby I mean the energy consumption to activate the card. This excluded the default energy usage the chip consumes when active.
     
  2. Awjvail macrumors 6502

    Joined:
    Nov 21, 2010
    #2
    Download an app like CoconutBattery and see if the power use spikes when it switches.
     
  3. mikeo007 macrumors 65816

    Joined:
    Mar 18, 2010
    #3
    No. An engine requires fuel to start because it needs to physically start moving from a stopped state. There's no physical parts in the GPU, the system just activates or wakes it when it's needed.
     
  4. runner77 macrumors member

    Joined:
    Nov 9, 2016
    Location:
    Berlin
    #4
    It doesn't cost energy for the switch itself. Of course the dGPU uses more energy, but that's about it. Basically the switch is doing nothing but routing the processing to a different chip.
     

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