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"Following the release of a firmware update yesterday that enabled the Power Nap feature on MacBook Air mid-2011 models, Apple has shipped a similar update for Retina MacBook Pros, reports MacRumors.\r\n\r\nThe update, which should be present under Software Update, enable's Apple's Power Nap, which it describes this way:\r\nWhen your Mac goes to sleep, it still gets things done with Power Nap.3\u00A0It periodically updates Mail, Contacts, Calendar, Reminders, Notes, Photo Stream, Find My Mac, and Documents in the Cloud. When your Mac is connected to a power source, it downloads software updates and makes backups with Time Machine. While all that updating is going on, the system sounds are silent and no lights or fans come on, so nothing disturbs you. And when your Mac wakes up, it\u2019s good to go.\r\nThe interwebs had been flooded with questions about where the feature was in the days since the release of Mountain Lion.\r\n\r\nNow that the firmware update is out, the feature has appeared in the Energy Saver control pane in System Preferences. If you\u2019re using a Retina MacBook Pro, hit up Software Update under your Apple menu to see if it\u2019s available for you."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apple/2012/07/27/apple-firmware-update-gives-retina-macbook-pros-the-power-nap-support-theyve-been-missing/>