hi, Yoledo.

oh, Editing the registry at your own risk..
..Did you enter it with DEC?
Plz care, The flag value must be on HEX, not DEC.

By the way,
if your MOBO is ASRock H81 BTC Pro R2.0,
Unfortunately, It have no TOLUD option. (TOLUD is fixed to "Auto")
but, You can try secondly method. (Disabling some unnecessary PCIE devices)

I wish you good luck.