We recommend to use Intel® Z77 SATA ports (SATA3_0, SATA3_1, SATA2_2, SATA2_3, SATA2_4 and SATA2_5) for your bootable devices. This will minimum your boot time and get the best performance. But if you still want to boot from ASMedia SATA3 controller, you can still enable this in UEFI.

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ASRock Z77 Pro4 manual