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When I manually switch one of my monitors off in a dual monitor setup does the GPU drop power consumption and stop sending a signal to the monitor?

Does it work the same way when Windows turns off the screen (via power options, the screen is set to turn off after a specified amount of inactivity).

If not, what's the best way to hibernate a display, decrease the load and power consumption of the GPU?

  • Unlikely because the GPU didn't turn them off. Even if there is it's likely negilible – Ramhound Sep 12 '14 at 1:56
  • So, when Windows turns off the screen (blinking/yellow power light on monitor, "standby mode") then the GPU stops sending a signal to the screen right? – paulkon Sep 12 '14 at 2:21
  • It's suppose to. You don't indicate what GPU you have – Ramhound Sep 12 '14 at 2:28
  • It's a GTX 670, but I'd also be interested in knowing how it work if Intel or AMD was the case. – paulkon Sep 12 '14 at 2:30
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AMD GPUs starting with HD 7XXX have a feature called ZeroCore which reduces the power consumption when the monitor is power off by Windows (not when you manually turn it off)

With Southern Islands AMD is introducing ZeroCore Power, their long idle power saving technology. By implementing power islands on their GPUs AMD can now outright shut off most of the functional units of a GPU when the GPU is going unused, leaving only the PCIe bus interface and a couple other components active. By doing this AMD is able to reduce their power consumption from 15W at idle to under 3W in long idle, a power level low enough that in a desktop the power consumption of the video card becomes trivial. So trivial in fact that with under 3W of heat generation AMD doesn’t even need to run the fan – ZeroCore Power shuts off the fan as it’s rendered an unnecessary device that’s consuming power. (Source)

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