I have the same mobo as yours (Z77-DS3H), and the same GPU (ATI HD 6670). I had KP every time until I disabled VT-d under BIOS Features. I also had to add npci=0×2000 flag. For ATI HD 6670 you will need to add GraphicsEnabler=Yes AtiConfig=Pithecia AtiPorts=3 PCIRootUID=0. I followed this two...
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