Should GT540M clock down when idle?

Hi there,
I've just bought an acer aspire 4830TG with nVidia GT540M & core i5. It also has Nvidia Optimus.

As you can see that the gpu load was initially high because i was playing game, and as soon as i close the game the gpu load went down.
However, the clock speed remains the same.
Shouldn't the gpu clock speed goes to idle when the gpu is not in use as it switches to integrated gpu??
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More about should gt540m clock idle
  1. It should just switch to the onboard gpu. Im not sure how gpu-z displays it but you should be able to check on the display options.
  2. thanks,
    display option only shows automatic gpu selection
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