780 Dcu II cap whine normal?

[unknownuser200]

On the 780 Dcu II is cap whine normal under load?

 

[Mr. Smith]

I have a 7950 DCUII which has cap whine. Try an FPS limiter set to 120/60 to see if that reduces it.

 

[notcool]

Probably yes, it's more or less a lucky dip like PSUs. Is v-sync turned off? see if it's any better with it on maybe. Is the card new? If you're in the UK you could just DSR it if you've bought it within the last 7 days. If the whine is very bad, you could try complaining to Asus and see what they say also.

 

[barnsley]

It can be if you get a bit unlucky with Nvidia cards. AMD 'cards are much more likely to have coil whine.

 

[Warchild]

Odd thing with my 780s is that I had Cap whine at stock when I bought them. As soon as I put them under water and put a reasonable overclock on them the whine disappeared. And thats running with Vsync off and 120hz

Isn't it usually the opposite way around?

 

[Mr. Smith]

Odd thing with my 780s is that I had Cap whine at stock when I bought them. As soon as I put them under water and put a reasonable overclock on them the whine disappeared. And thats running with Vsync off and 120hz

Isn't it usually the opposite way around?

As always, it depends...

The inductors in a graphics card are for the most part used in its VRM, or voltage regulation module. VRMs are a type of DC-DC switch-mode power supply, usually a synchronous multi-phase buck regulator. This means that it uses a bunch of "phases" in parallel, each consisting of a pair of transistors, an inductor, and a capacitor, to change the +12V input from your PSU to 1.xxV for your GPU to use.

In order to supply a different voltage or different current the transistors switch on and off at different frequencies. If the GPU demands more current, then that will cause a voltage drop across the inductor, which makes the transistors switch faster to keep the voltage where it needs to be. And the reverse. All this happens in microseconds.

An inductor stores electricity in a magnetic field. This magnetic field pushes and pulls on the ferrite core used in some inductors. When the voltage across the inductor changes, the magnetic field changes, and the inductor moves slightly. When the voltage changes very, very quickly (as is the case when switching transistors are changing its voltage thousands of times a second) the inductor vibrates. And that vibration, if it is between 20Hz and 20,000Hz, is audible to the human ear. Hence whine.

The frequency at which the switching transistors operates varies, but it's generally between 10,000Hz and 100,000Hz. If your GPU is whining, the transistors are switching at between 10,000 and 20,000Hz, or a primary harmonic of those frequencies. So if you want to stop the whining, you need to make the transistors operate at a different frequency.

So you change the amount of power drawn. Overclock and overvolt your GPU and the transistors will need to switch faster to provide power to the GPU, and if you're luck you'll bump them from 17,000Hz to 24,000Hz. Underclocking may work as well. And suddenly your GPU will whine no more.

 

[unknownuser200]

I notice it when i did to things. when i took V sync off on the the None demanding l4d2. it jumped up to 400 fps. I just did it for laughs. it sung me a song. and when i updated my score on windows. if i play l4d2 with the vsync on. Its completely quiet. if i play diablo 3 quiet. i havent tryed other games yet but ill let you know.

i know when i use to mess with google sketch up on the 470 gtx. it did the same thing. im thinking its the psu delivering a poor ripple and its time to replace it. Maybe with an a 860. Is there any real advantage to buying the 860 i ?

the current psu is a ocz 1000watt Z series. which at the time of purchase ( 5 years ago) was one the top rated psu's and one the only few that had a single 83 amp 12 volt rail.

 

[unknownuser200]

overclocked the card today whine was still there sometimes less sometimes more then normal depending on the overclock. start getting alot of buzzing during very high overclocks in valley runs

did however get the card stable at 1297 mhz core 7100 vram