I spent a bunch of hours with the Z77MX-QUO-AOS motherboard this weekend using the Hermitcrab Z77MXQUOAOS.H3A.739M bios and in a multiple operating system environment there seem to be issues. I have Windows 7, Windows 8 as well as OSX 10.8.4 installed on seperate hardrives set up as stand alone drives during the initial installation. With all three drives attached the bios tends to lose track of one of more hard drives, the most common problem I had was waking the computer from sleep in OSX, rebooting and then toggling F12 during reboot to try and select one of the windows drives. his also happened when using Windows and then trying to find the OSX drive on reboot using F12.
Sometimes the drive showed in the boot menu, sometimes not. Booting into setup hard drives would be mssing that were still connected. The drive would be missing from the hard drive priority menu and options boot menu drop down list until shutting the machine down completely and then restarting. Occasionally needing to repeat the shut down process more than once to get teh drive to show back up. A liitle flakey...flashed back to the original bios and went back to chameleon in a fresh OSX install and everything is more or less fine, no missing hard drives same configuration.
The one other issue I am having with either version of the bios is with the two Sata 6gbs connectors. I have three SSDs, one is and OWC Mercury 3GB Sata, one is a Vertex 3 from OCZ and the other is a Patriot Pyro LE, these are all left over from various other configurations and play together no problem on other Z77 and H77 boards.
On the Z77MX-QUO-AOS I can't share the Sata 6GB with two SSDs, one in connector 0 and one in 1. The drive in connector 1 does not get recognized, the drive in connector 0 is fine....I can attach the second SSD to one of the four SATA 3GB connectors and there are no issues...seems like a bios issue. Any suggestions as to why it would be an issue would be appreciated.