Make sure you have these set on the bios


    set VTd INTEL VIRTUALIZATION to DISABLE.
    set ONBOARD AUDIO/SOUND (AZALIA) to DISABLE.
    set IEEE1394 to DISABLE.
    set PCI-E SUBSYSTEM/LANES to x8/x4/x4
    set ONBOARD GRAPHICS to DISABLE.
    set PCI-E GENERATION to GEN2.
    set CPU FREQUENCY SCALING to DISABLE.
    set CPU PERFORMANCE MODE to ENABLE.
    set FAST BOOT to DISABLE.
    set CSM to ENABLE.