Hello, I have also have the Z87 Sabertooth with the 4770K CPU.
I am able to boot up Clover and see the listing of drives. I select the option to Boot OS X Install from my drive, however nothing happens when I click Enter.
Not sure if it has been said already in the forum but...
For anyone else who has this motherboard, you have to go to the Advanced section of the Bios and under the Boot section, change the Security from Windows OS to Other OS, otherwise this will never boot up.
Click Exit/Advanced Mode
Click Advanced Mode
Select the Boot menu option
Scroll down and click Secure Boot
Then change Windows UEFI mode to Other OS
Make sure to boot with the UEFI USB drive option upon the next boot up.
This is as far as I have gotten.
Any help would be great!
Thanks,
CGRTist