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

[Peteruk]

Contact Thermaltake and see if they think its the PSU.

[pink_waters]

here is the power supply I use

currently, I have this PSU hooked to radeon hd 5870 by 2 PCI-E power cables..
and I have another 1 sata power cable that I have hooked 2 hdds to it...
and another molex power cable that have 2 12v fans hooked in it..
thats all...
the remaining 4 fans are connected to the motherboard fan headers

I don't think any of my friends would have a PSU high enough for my system.. so this could be a problem...
I will try to contact thermaltake... but I know the response already

I meant by EIST, the accompanying VCORE changes with it, and of course its related to C1E..
as of course turning C1E and EIST removes the problem..

[pink_waters]

sorry for the double post..
but I read that in the corsair fourm they list that disabling C1E removes noise if experienced...

so a state like that tells me that this issue is common and not related to PSUs...
am I right?

[Dark Mantis]

There are many issues with noise at the moment and most of them are "cured" by disabling the power saving options in hte BIOS. Obviously these are really only a temporary workaround but do stop the noise. There have been some breakthroughs recently especially on the UD3 boards where Gigabyte are doing a hardware fix on the motherboard itself. As far as I am aware this only applies to the UD3. This seems to be caused by a incompatibility between the motherboard and the PSU and has nothing to do with the quality of either component. At the moment it is a case of stopping the noise for now whilst waiting for a fix to be found.

[Peteruk]

Like I said I'm just asking you to Contact Thermaltake and see if they think its the PSU.

Just an idea try running the PSU off your UPS without your UPS plugged in the mains.

[pink_waters]

I tried operating it without the UPS, and the noise still exists ...

tried isolating the GPU by replacing the graphics card, and the noise still exists...

[Dark Mantis]

What response did you get from Thermaltake?

[pink_waters]

I've sent an email, didn't reply yet..
I will post as soon as they will..

side question..
shouldn't the PWR_FAN header drive case fans to full speed?
because I've noticed while monitoring the rpms of the fans connected to mobo headers, that they are all  running @1300rpm, while the fan connected to PWR_FAN header running @1120rpm..

[Dark Mantis]

Are they all the same fans anyway? Different fans will run at different speeds.

[Peteruk]

I tried operating it without the UPS, and the noise still exists ...

No..no with the UPS so that you unplug it and it powers the PSU.

[Dark Mantis]

What Peter is saying is leave the computer plugged into the UPS but unplug the UPS from the mains supply. That way you will be using as DC inverted to AC power supply that is very smooth.

[pink_waters]

the fans are all the same...

about the UPS..
no, my UPS on battery makes very bad noise through the PSU... its something related to the sine wave output I've read on the web...
very bad noise, loud and scary , even if the PC is shut down.

[Dark Mantis]

Slightly off topic but what make/model of UPS are you using? It should be silent.

[pink_waters]

its a crappy PSU too, not a fancy brand...

btw, its not the UPS that makes the noise,..
the UPS on battery causes my PSU to make horrible noise..

another thing, whats the cause of this random internal speaker beep, that occasionally happens during using windows ?
is the c-states causing this?

[Dark Mantis]

No, I did realise the noise was coming from the PSU not the UPS but I was just interested in why the even "crappy PSU" would make such a noise. It should be silent almost. If it is being fed an almost perfect sine wave input I would have expected it to be quite happy.

While I was just re-reading your thread it occurred to me that you could always use another PSU in tandem as a slave PSU and that way increase the output for trial purposes.