Well to cut a long story short Gigabyte thought they could just do a bodge up by issueing a BIOS update which basically just turned some of the power saving options off. As I said this was just a workaround but it did stop the noise for now. I understand that there is now a hardware fix being offered and if it applies to you then you will need to PM runn3r the Gigabyte Moderator of the forum to arrange it.
The cause of the issue is a bit complicated but in a nutshell is due to feedback frequencies in the coils.
the hardware fix seems like a replacement at least for some parts...
but I think this arrangement would be hard for me, because I am overseas, and that would cost me the mobo price lol..
but then that gets me worried if every other p55a-ud6 in our stores stock has the same issue
edit: does the issue with x58 boards do the noise around the cpu only, or does it transmit the noise to the psu ?
Like I said your PSU maybe faulty (being that its not cheap one) not that it can't give a stable power out but due to the sudden drop or increase in voltage & current used by CPU on demand also if your AV is below 115V or not at 60Hz that can cause power regulation problems.
What you can try is to set in the BIOS > MB Intelligent Tweaker(M.I.T.) > Advanced Voltage Settings the" Load-Line Calibration" to enable.
well, I have my PC connected to a UPS, I will try hocking the pc straight to the AC line to see if that would make a difference...
regarding, load line calibration.... well I have this off, because I heard that when enabled, it may cause CPU voltage spikes which could do unwanted damage..
I see the gist of why you are proposing this, but if that worked, it would still be a workaround, but much better workaround than disabling c1e, in case i didn't get a cpu spike