This article originally appeared in TidBITS on 2013-10-27 at 6:57 p.m.
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iMac SMC Firmware Update 1.1

by Agen G. N. Schmitz

Apple has released iMac SMC Firmware Update 1.1 [1], which is recommended for recently released iMac models that have been configured with PCIe-based flash storage (see “Apple Updates iMac with Faster CPUs and 802.11ac Wi-Fi [2],” 24 September 2013). The release improves the Power Nap feature in OS X 10.9 Mavericks so that it runs silently while your iMac is sleeping without spinning the fan. (Free update, 921 KB)