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OMG I have the exact same motherboard and CPU as you and the exact same problem. Motherboard = Gigabyte Z77 DS3H Version 1.1 BIOS version = F9 (Current and up to date) F10 is beta so no thanks! OC RAM = 1600MHz (correct) Intel I7 3770K OC from stock 3.5GHz to 4.0GHz (shows up in BIOS and Windows 7 as 4.0GHz) I am running OSX 10.9 Mavericks CPU shows up as 3.5GHz only No USB 3.0 (Have not tried sleep to get it working) I would also love for someone genius to tell me how to fix this! I bought this board as it was recommended but frankly speaking it is rubbish for hackintoshing!