p55a-ud6 making PSU make screeching noise when C1e/EIST on

[Peteruk]

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

Here it seems to suggest at the bottom “In the mean time, enable LLC and enjoy the stable VCORE!” with others OC their CPU and increasing the voltage to the CPU having this LLC (Load Line Calibration ) enabled is not likely going to cause any issues.
http://www.overclockers.com/load-line-calibration/
 

[Dark Mantis]

After reading Peter's link there to overclockers.com I think Bob did a thorough job of testing for spikes which I might add he didn't find, so I think you are safe in enabling the setting.

[pink_waters]

I will test and see if it has the same effect of disabling c1e...

[pink_waters]

nah... LLC does not fix the issue..
sure, it should not... because those noises are accompanying the change on vcore that happens while cpu is shifting back and forth between lowest multiplier and 20x multiplier...
ie going from being stepped down to full speed and so on..

I've noticed the way EIST works... which I find weird. and don't know if it works with you like this or not..

it seems that under light loads.. the cpu is shifting to full speed, then gets stepped down, then full speed again, then stepped down... etc..
it doesn't keep a constant clock...due to changing multipliers... so that means that vcore is going up and down every second on light loads... and I think that what produces the noise...

of course thats not the case with high loads, which makes the cpu constantly full speed

I concentrated on listening to the noise closely..it pretty much seems like a hdd on activity...a bad hdd which when spins makes a little squeaky whistle
this noise is both annoying and keeping me worried on the same time...

[Dark Mantis]

There is another way that is supposed to help stop the noise and that is to fix the core voltage rather than have it on auto.

[pink_waters]

yeah, but that would render c1e useless...

well there is an activity that I am able to reproduce the noise with evey time i try which is just opening internet explorer and scrolling a page up and down with the mouse wheel,
it does not produce the sound If I scrolled by left clicking and holding the slide bar and sliding up/down... I have to use the wheel to reproduce the noise..

also If I have the internet explorer window in the foreground and move the mouse around it into whatever webpage displayed on it, It reproduces the noise but quieter

[Dark Mantis]

Are you using a Logitech cordless mouse? If  not what are you using?

[pink_waters]

no, I am using a crappy standard USB mouse :/

[pink_waters]

i noticed why scrolling with the wheel produces the noise in the psu, and scrolling without the mouse wheel does not...

I opened CPU-Z and compared the difference while doing both things..

scrolling with the mouse wheel: makes the CPU goes to full speed from 9x multi to 20x multi.. accompanying the voltage raise
scrolling without the mouse wheel: does not raise the multiplier and the cpu stays stepped down...

also tested moving the mouse around the internet explorer web page, makes the cpu go full speed, and thus the noise..

how mouse movements supposed to raise the multiplier and make the cpu go full speed ?!

[Dark Mantis]

Well in view of what you have just posted I would suggest replacing the mouse. It could just be a faulty mouse and they are cheap enough to at least remove this possibility from the equation.

[pink_waters]

the mouse maybe be causeing the stepping up/down of the processor..
and this processor behavior happenes in other conditions thats not related to mouse, when I am using a pro audio editing software..

the problem is that this stepping should not produce this noise on the PSU..

I will try anyway to replace the mouse and see if there is any difference..

[pink_waters]

ok, changed the mouse, even used another usb port..
THE SAME PROBLEM...

its really getting under my skin..

[Peteruk]

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...

Did you try that in the end?

[pink_waters]

yeah, I've just finished trying without the UPS...
the SAME Problem...

I am really getting worked up....

it seems very obvious its a Speedstep problem!...
I don't know how it supposed to work, but its pretty JUMPY... and of course VCORE jumps with it..
and that causes a noise in the PSU...

which to blame.. the PSU or the MOBO.. I don't know
and if one is blamed, I am not sure if it should be considered faulty as it may work in other configuration without the issue.
I have limited recourses to do trial and error, so I don't have any spare PSU here to try...
of course I removed from the equation the GPU... I am not sure but I don't think it has anything to do with C1e...

[Dark Mantis]

Have you tried disabling EIST inthe BIOS?

Can you just borrow a PSU from a friend to try?