In the Battery tab is an option, disabled by default, to Enable Power Nap While On Battery Power. In the Power Adapter tab is the option, enabled by default, to Enable Power Nap While Plugged Into A Power Adapter. There are two places you enable Power Nap’s features on a supported Mac, both in the Energy Saver pane of System Preferences. The Power Adapter tab of Energy Saver preferences lets you choose whether Power Nap is enabled when your Mac is connected to AC power. Each of these models requires a SMC firmware update ( Mid 2011 Air, Mid 2012 Air, Mid 2012 Pro Retina) to support Power Nap. Which Macs are compatible? Currently only the Mid 2012 MacBook Pro with Retina Display and the Mid 2011 and Mid 2012 MacBook Air models. Under Mountain Lion (OS X 10.8), if you’ve got a compatible Mac laptop, you’ll get many of the same benefits thanks to a new feature called Power Nap. These devices will even back up to iCloud and sync with iTunes when unattended. To wit: With our iPhones and iPads, we’ve come to expect that even when the device has been asleep, waking it will immediately present us with our latest email messages, events, reminders, changes to contacts, and more. But even the most anti-iOS Mac user has to admit that sometimes this is a good thing. More than a few Mac users worry that OS X is becoming too much like iOS, thanks to the former gaining features obviously inspired by the latter.
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