3 p8p67 pro asus motherboards exhibit controller failures on the 3gb channels, tried replacing hard drives,ram, sata cables and power supply only loose the hard drives and dvd burners on the 3gb channels works fine on 6gb channel.
I have had all customers that bought new systems with new chipset all have this problem.
More about :sata 3gb failure 2nd rev cougar point chipsets
Sending boards back to supplier for RMA some are even missing chipset heatsinks i noticed as soon as i opened mb box.
Im up to 5 with failures now if i move sata devices to 6gb ports works fine, all machines end up with BSOD in windows and drives no longer show up in bios.
Ahci is not used also the hard drives are seagates 500 ,and 1tb
The boards without the heat sink i noticed as soon as i pulled it out of that anti-static bag.
Also the lg dvd burners were also not showing up in the bios as well so it was the 3gb controller.
As soon as i moved both hdd and dvd burner to 6gb port no more problems.