Didn't know that you are speaking about this...this is the way I installed but I still have the noise. Now I installed Mojave, and I injected same way and here there is no noise anymore but after I installed my nVidia GeForce 9600GT, my monitor working only on resolution 1280x1024 instead of 1920x1080. I thing accelaration doesn't work. For Mojave, do I need another DSDT or works the same from High Sierra? Can you sort my video card resolution/acceleration with a new DSDT?
Here are some prints: