I listen now...  I hear only case fans on Balanced speed from H100.
That's only what I hear at the moment, graphic fan is on 31% and that's more silent.
If you had 3 buzzing PSU, different type maybe something cause that in your power.
I mean all of them had inside similar parts and work on similar way... maybe something cause buzzing noise...
 

I have EVGA SuperNOVA 1200 P2 but it's same with 1000 P2, 1000 G2, 1300 G2, ....
To check when my PC is off? I never hear someone complain on noise from PSU when PC is off.
My PSU is dead silent because I have 400W space free, and when Eco Switch is Enabled and fan not work and that's even more silence.
 
 

I have to ask,why would you want your ear that close to your case and if you have to get that close to hear it then surely when your in any other area in your room you wont hear it, correct?!?! Being that its happening with the pc off and no load on it, try plugging the psu into a different outlet in the house, one with no large draw devices on it, and see if that changes anything. If that doesn't change anything, try running that psu at a friends house or your local pc store and see if the hum continues. Being that transformers are really dangerous whether plugged in or not, i don't feel comfortable going into other things you can do to probably asses/repair the problem.

Hi Guys, thanks for reply. Please see my comments below.

wmmills
I have to ask,why would you want your ear that close to your case and if you have to get that close to hear it then surely when your in any other area in your room you wont hear it, correct?!?! Being that its happening with the pc off and no load on it, try plugging the psu into a different outlet in the house, one with no large draw devices on it, and see if that changes anything. If that doesn't change anything, try running that psu at a friends house or your local pc store and see if the hum continues. Being that transformers are really dangerous whether plugged in or not, I don't feel comfortable going into other things you can do to probably asses/repair the problem.

In normal circumstances I can't hear it of course as this hum/buzz is very quiet and you need to go as close as 20 inches and really focus to be able to hear it. But I have a very silent PC (3 noctua fans running at 350 rpm in idle so they are inaudible) and during the night when everything is quiet I can hear only this sound coming from PSU because simply the computer metal case amplify the buzz. It is not loud but it's there and I can't stand that :) I'm very sensitive on this things and hearing any electrical noise concerns me.
 
There is no problem with PSU load whatsoever, I'm talking about the electrical buzz coming from transformer coils once you put the cord to the outlet and turn the PSU switch out - nothing else connected to the PSU. I've tried different outlets but the same results. I know that transformers can make noise if winded not carefully so I would say the quality control of Corsairs and Seasonic transformers is poor. Therefore I'm looking for EVGA, my last hope :) I need a PSU which operates in zero rpm mode but without any electrical noise coming from it. Corsairs and Seasonic failed for me so this is my last hope :)
 
Eventually I could live with that buzzing if this would be because of technology used, but I have older Antec 520W and if I put my ear to it there is no buzz, no difference between ON and OFF switch position. So I know if it possible to have no buzz, I just need to be lucky enough to find a good manufacturer.
 

Vlada011
I tried that when before I installed PSU first time. They recommend "paper clip" method only with PSU you get little Bridge Tool between black and green wire and you don't need paper clip. When I enabled power switch fan start to spin and I didn't hear noise, than as recommended I enabled Eco Mode and fan stop as should and I put ear on PSU, i didn't heat nothing.
Now I turned off PC as you say and check with power switch on and off it's same, no noise from PSU, no cracking, humming, buzzing, nothing, when PC work my top part is much louder because fans and PSU fan not work, when I put ear down noise is more and more silent how I come close to bottom of case.
 
But I afraid maybe something cause to your PSU emit noise. I mean 3 different PSU and all of them same noise.
That would be at least different kind of noise. You should check with completely different platform, example Super Flower as EVGA SuperNOVA, Antec, Enermax...but nothing is 100% warranty for silence. If you had problem with CORSAIR HX and Seasonic X as famous coil whine platform, that's probably identical platform... 

 
Thanks for checking! This is great to hear. This is exactly I wanted to know - to you stick your ear to the PSU and listen if there is difference in noise between ON and OFF position. If you can't hear anything there is most probably no issue with transformer buzz. So you gave me hope and I will eventually try 1000W P2. It's pretty expensive (200 Eure) so I hope the quality will be top without any electrical noise at all.
 
Can you do last test for me for final confirmation? So I assume you have PSU on bottom of your case, right ? Switch your PC off with the power switch, and also press the power switch button on PSU OFF. So your pc is cut out of power. In this stage no noise can be produced by PC/PSU. Now stick your ear to the bottom of your case (left side) where PSU is located and still with your ears on a case turn the PSU switch ON. Can you hear the difference ? If not, this can definitely confirm there is no electrical noise coming from PC when your pc is OFF/standby.
 
For your second part of the comment, yes it's slightly different, buzz on RM750 was a bit louder than HX1000i - it is because each transformer coils are winded differently but if there are not tight enough they can produce buzz - simply it's poor quality control. And my Antec 520W is dead silent so outlet can't be an issue. And you right, I think I've read that transformers for Corsair are done by Seasonic so most probably they use the same ****ty transformers :)
 
Antec is great but they don't have PSU with zero fan mode. This EVGA 1000 has 0 mode up to 400W which is great for me. Do you know about Enermax or Super Flower with 0 fan mode ? 

I thought that Corsair HXi and Seasonic are top but seems I was wrong. Interesting is that RM had similar noise as HXi :) Also Seasonic produced this sound. But if Seasonic is a supplier of transformers for Corsair then it does not surprise me....  Damn, these are pretty expensive PSU so I would expect super quality without compromises. It's not definitely a power outlet issue - I have Antec and no sounds whatsoever. In my opinion it was because ****ty produced transformers.

Yes, it's a lottery. But I can't believe that I've bought 3 PSU in 3 days and all had the same issue. My cheap Antec has no noise but is loud as hell, so I've modded it with 140mm Noctua fan connected to the board fan header and up to 100W consumption I run it on 400rpm and it's dead silent :) When gaming I have it on appx. 800 - 900 rpm, hope it will not blow up :) But better I would have a regular zero rpm PSU but without buzzing. If Antec can make it why not Corsair or Seasonic ? I would prefer lower quality without buzz than a high quality with buzzing. I have bad feeling about it...

This looks nice :) Maybe this is really a better platform than Corsairs and others. Transformers are pretty encapsulated, maybe I will give a try to this EVGA :) Btw, corsairs transformers were also somehow encapsulated but the noise was there...
 
You know, most users will never notice that noise because it is hard to hear that at all. If you don't have super silent PC, there is no chance to notice. The fans are louder. 99% users will not find it. Therefore they pay more attention to +1% voltage regulation because this can be seen in benchmark. Some mirror noise from components can not and they do not care.
 
With GPU you are right, GTX970 is completely screwed up series. Not only all brands have this coil whine (mine too, but only with high FPS) but the memory architecture is crippled - well by CEO of Nvidia this is a "feature" :)  How many samples ? Around 1 million sold....

I told him same, but that's not enough to try 1h in shop, PC should work 2-3 days in different conditions.
 

Transformers are a form of inductor.  Inductors work based on the principle of pulsating electromagnetic fields.  Have you ever stood next to a large transformer in your neighborhood or next to a large store?  If so, you have surely heard that buzzing noise.  Have you ever heard street lights at night?  They buzz as well.  All inductors will cause a buzzing noise.  Some will be louder than others.  Some will be in the range of human perception and some will be out of the range of human perception.  But they will all make noise.

Do you use and play games "with your ears very close to the case" if not then it really is not an issue.
Most all Electronic Devices make a small amount of noise or sound.
I wish I could trade in my refrigerator because of the sound it makes after only 2 years. 

Yes I read it, I do not hear any noise from any of my EVGA PSU.
Fan sometimes when it kicks in. I have a 430, 750G2, 1300G2, and 1600G2.
I should also say that all of them are plugged into a UPS Unit and not directly into a wall socket.

bcavnaugh
Yes I read it, I do not hear any noise from any of my EVGA PSU.
Fan sometimes when it kicks in. I have a 430, 750G2, 1300G2, and 1600G2.
I should also say that all of them are plugged into a UPS Unit and not directly into a wall socket.

Fan is OK, this is about buzz comming from somewhere from PSU even all the cables are disconnected and only power cord is connected and PSU switch is ON. If you get close you can hear a quiet "bzzzzzzzzzzzzzzzzzzzzzz". Once you press power switch off, the buzz is gone what is pretty clear - no power, no buzz. Did you try to hear from a really close distance appx. 3 - 5 inches ? If you'd put your ear straight on the PSU case you would clearly hear it... I know this is not standard but if I put my ears on Antec I can hear nothing.... So this is what I mean here. Do you run it on 110V or 220V ? It can be than EVGA and other brands build on Super Flower platform do not have this "glitch". I've tried only 2x Corsairs and 1x Seasonic. But Corsair is in fact Seasonic :) So it is very likely that both share the same issues. I did not know this before though. Tomorrow I will get 750 G2 so I will report back, but I don't if I want to know it :) You know, if you don't know about it, your heart does not hurt but if you do.... :) 
 

Vlada011
I think Transformer is not only part sensitive on noise, and other things could cause buzzing noise.
Do you have some video to show us similarity, something similar as yours problem from youtube example.
 

You may be right, but first thing hit when you bring the power is transformer. Be aware that the PSU is still in standby mode withouy anything connected but power cord. I know transformers buzz like this so that's the reason why I assume it's a transformer problem. Coil whine is something different.
 
Video? I did not find it on youtube but it's something like this but much more quiet :-D
 
https://www.youtube.com/watch?v=21E8DIlkPiQ
 
And it is like a problem this user described here :
 
http://www.tomshardware.co.uk/answers/id-2418289/unnatural-buzzing-sound-psu.html
 
 
 

I can hear a faint buzzing sound coming from my Corsair 1200W (CMPSU-1200AX) power supply.  As you have observed, the only time I can hear the faint buzzing is if the computer is off and I put my ear right up next to the PSU.  My Thermaltake 1200W PSU exhibited the same behavior.  I have assumed that this is perfectly normal.
 
When the computer is "off" but the power switch on the PSU is "on", the PSU is still technically on.  Even though the computer isn't "on", the PSU is still providing your computer with low current 5 volt standby power.  The standby power is used to control the "power on" feature through the motherboard and is also used to keep data in memory if you put the system to sleep.  That being said, since the PSU uses PWM and transformers, you most likely will always hear some buzzing from many PSUs when the system is off.  The buzzing noise will either be coming from a transformer or from an inductor in the PWM circuit (or coming from both the transformer and inductors).
 
I am not sure what else to  say other than saying that I think you will have a hard time finding a PSU which makes zero noise when the computer is "off" but the PSU switch is "on".  The home's electrical wiring can also have an affect and so may 110v vs 220v supply.

"ears on metal case of PSU ?" Yes on all sides
"night the ambient is very silent" you are one of the lucky ones.

misiak
This is really great to hear! I'm very exciting for tomorrow to find out :) But wait a sec, I'm not sure I want to find out :) btw, do you have 220 volts in your outlets? And what do you mean I'm lucky? Because I have silence during night ?

 
None that I can use, sorry.