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70-687 Configuring Windows 8.1 – sample exam – Q46

You deploy several tablet PCs that run Windows 8.1.
You need to minimize power usage when the user presses the sleep button. What should you do?

A. In Power Options, configure the sleep button setting to Hibernate.
B. Disable the C-State control in the computer’s BIOS.
C. Configure the active power plan to set the system cooling policy to passive.
D. In Power Options, configure the sleep button setting to Sleep.


Correct Answer: A

Explanation:
http://www.howtogeek.com/102897/whats-the-difference-between-sleep-and-hibernate-in-windows/ If you’re using a laptop computer, the best option is most likely Hibernate, because it saves the most power compared to Sleep and Hybrid Sleep.
http://windows.microsoft.com/en-us/windows7/sleep-and-hibernation-frequently-asked-questions Sleep and hibernation: frequently asked questions
What’s the difference between sleep, hibernate, and hybrid sleep?
Sleep is a power-saving state that allows a computer to quickly resume full-power operation (typically within several seconds) when you want to start working again. Putting your computer into the sleep state is like pausing a DVD player — the computer immediately stops what it’s doing and is ready to start again when you want to resume working.
Hibernation is a power-saving state designed primarily for laptops. While sleep puts your work and set¬tings in memory and draws a small amount of power, hibernation puts your open documents and pro¬grams on your hard disk, and then turns off your computer. Of all the power-saving states in Windows, hi¬bernation uses the least amount of power. On a laptop, use hibernation when you know that you won’t use your laptop for an extended period and won’t have an opportunity to charge the battery during that time.
Hybrid sleep is designed primarily for desktop computers. Hybrid sleep is a combination of sleep and hi¬bernate — it puts any open documents and programs in memory and on your hard disk, and then puts your computer into a low-power state so that you can quickly resume your work. That way, if a power fail- ure occurs, Windows can restore your work from your hard disk. When hybrid sleep is turned on, putting your computer into sleep automatically puts your computer into hybrid sleep. Hybrid sleep is typically turned on by default on desktop computers.
Further information:
http://www.hardwaresecrets.com/article/611
Everything You Need to Know About the CPU C-States Power Saving Modes
In order to save energy when the CPU is idle, the CPU can be commanded to enter a low-power mode. Each CPU has several power modes and they are collectively called “C-states” or “C-modes”.

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