I got a ga-h61n-usb3 (with a i3 3225) with 10.8.2 installed.
Sleep works well, but on waking up, usb devices (thumb drives, mouse and keyboard) disconnect and comes out the message "Disk improperly ejected."
The strange thing is that I use the usb mouse to get out from sleep, so I think that is powered during sleep (and when I click to wake up, for some seconds it's not responding...)
I read that if there is a (fake) hub on the bus will not be powered during sleep.. (I attached 2 screenshot, on my hack there is a (inexistent) hub beetween the thumb drive and the bus, on the macbook the thumb drive is connected directly on the bus)
A on another post that could be ehci/uhci (I'm not an expert of it...)
And on another topic I have read that disabling cpu pll overvoltage solved this issue on a GA-Z77X-UD5H
What's your experience on it?