Does sandy bridge switch to onboard graphics to save power?

In netbooks with intel atom processor and nvidia ion graphics it used Optimus technology to save battery life. Do sandy bridge desktop/notebook processors do this as well ?
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More about does sandy bridge switch onboard graphics save power
  1. Im sure SB gpu is always disabled when a discreet gpu is found on the system but most new Nvidia/AMD gpus are quite good on power in idle anyway.
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