Ever since I bought my Asus P9X79 Pro motherboard, it get's an electrical buzzing noise around the CPU socket area. It only happens if I have C1E, C3, C6, or C7 enabled in the BIOS with vcore set at Auto. I had an i7 3820 before my 3930k and it still did it with the 3820, only did it quieter. I also tried another 3930k chip and my motherboard still gave me the same noise as this one. I have a Corsair TX850w power supply that I bought 4 years ago and I"ve been thinking about buying a Coolermaster Silent Pro 800w if it will get rid of the electrical buzzing. I talked to Asus about the buzzing and they are blaming it on my hard drive so I really can't convince them that it is from the motherboard until I try out another motherboard and see if the problem persists and that means buying a new motherboard and taking everything apart. Also I heard that some power supplys can cause this problem with CPU power saving features enabled. I can go out and buy the power supply and see if the electrical buzzing sound happens and maybe I should get a new power supply anyways because my power supply is getting old. It would be cheaper and easier for me to just replace the power supply than the motherboard. The electrical buzzing sound happens when I load FSX and sometimes while I browse the internet. I had this board for 1 year. I know a few workarounds the the problem but I end up disabling major features of my CPU which I don't find acceptable.