I have attached the information requested
OS X version: mavericks 10.9.5
motherboard model: GA-Z87N-wifi
BIOS version: F6c
graphics: nvidia GTX 680
Procedure/Guide Used : this procedure
intel power gadget now looks like this!
thanks a lot!! ;)
I bought a DAC, and audio problems are over! and the sound is much better!
They tried these two, are equally good