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Why do I hear extra noise when using 2 monitors w/460 graphics card?

Last response: in Graphics & Displays
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November 26, 2010 6:58:30 PM

I am wondering if anyone can help me out with this strange and puzzling problem that I am experiencing.

I am using a a single Gigabyte GV-N460OC-1GI (GeForce 460) card

http://gigabyte.com/products/product-page.aspx?pid=3530...

into which I have a couple of Samsung P2450H monitors connected via the DVI cables:

http://www.samsung.com/us/computer/monitors/LS24LRZKUV/...

My motherboard is a ASUS P6X58D Premium, my case is a HAF-X, I am not overclocking my i7-950 and my CPU cooler is a Cooler Master Hyper 212+.

So here is what I am expereincing. 90% of the time when I have BOTH of the monitors turned on, I hear a very faint high-frequency noise emulating. If I have only one of the monitors turned on (doesn't matter which one), there is no noise. This "extra" noise is coming from somwhere within the case, so it could be the motherboard or the graphics card or ???. I very much doubt that it is any of the fans, as those are nearly silent and I would easily notice this by seeing "faster" RPM speed when I run Everest Sensor program. Also, I have double checked that Windows 7 display is setup for 60Hz for both of the monitors. My system is only 3 weeks old, and I doubt it's a capacitor issue (?!?)

This noise is barely audible, but I definately hear it (I am a professional musician...). The noise is very different that the one people used to get when we all had CRT monitors and were trying to run in the "wrong" resultion. That was a very clear high frequency pitch that almost everyone could hear.

Does anyone have any ideas what could be happening?
a c 173 U Graphics card
a b C Monitor
November 26, 2010 7:29:37 PM

It is the choke coils on the card, I have the same card and they do get rather toasty. The cooler is fairly good at keeping the core cool but the rest of the card isn't as well cared for so I would go ahead and RMA the card if at all possible. You can set the fan speed to max to help keep the coils cool but that may not help much at all.
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a b U Graphics card
November 26, 2010 7:37:55 PM

nforce4 likely has it nailed, and another way to test it is to open the case, lay it on its side (heat rises), and even use an external fan to try to keep the card cooler for test purposes. If "cool" makes the noise go away . . .

Also: Does the noise occur when you clone a single desktop @1920x1080 on both monitors? or only if you extend the desktop? If only the latter (vid card working harder), it could also be a psu issue ig its marginal - you didn't tell us its spec/age.
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November 27, 2010 11:17:15 AM

Folks,


Thank you for the responses. I am using "extended" desktop at 1920x1080. Also, my PSU is supposedly a good one:

It is Silencer 910 from PC Power and Cooling:

http://www.pcpower.com/products/description/Silencer_91...

Is there an utility (Everest doesn't seem to have it), that can tell you about the fan speed (there are two on this graphics card) of the graphics card?
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November 27, 2010 11:28:22 AM

nforce4max said:
It is the choke coils on the card, I have the same card and they do get rather toasty. The cooler is fairly good at keeping the core cool but the rest of the card isn't as well cared for so I would go ahead and RMA the card if at all possible. You can set the fan speed to max to help keep the coils cool but that may not help much at all.


Thanks for the feedback. How does one set the "fan speed to the max"?
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a c 173 U Graphics card
a b C Monitor
November 27, 2010 1:03:59 PM

Under Afterburner set the fan setting to 100%. It shouldn't be noisy unless the bearings are bad. Also I learned last night that I can remove the fans to some degree without removing the cooler enough so that I can clean them. Its the choke coils and the caps that are the worst while the power vrm mosfets don't have enough cooling despite the fact there is a small heatsink which is more than most cards have. This generation didn't have quality in mind.
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November 28, 2010 2:06:45 AM

<<Under Afterburner set the fan setting to 100%.>>

Sorry, but I need to find out where is this "Afterburner" located? Do you mean the software Afterburner 2.0.0 ?
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November 29, 2010 3:45:50 PM

I finally tried the afterburner, and I can tell you that the "noise" has nothing to do with the fans. Of course when I jack them up to100%, I hear a very clear "woosh" sound. But even bringing down the fans to "30%" does not make the higher-frequency sound go away.
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