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Mar 24, 2014 4:45 AM in response to mmmmnaby a brody,No, it is not.
http://support.apple.com/kb/HT1395
iMac Firmware Update Download Document No. iMac (USB 2.0) no update needed iMac (17-inch 1GHz) no update needed iMac (17-inch Flat Panel) no update needed iMac (Flat Panel) no update needed