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Guru3D.com » Review » Gigabyte GeForce GTX 460 SOC review » Page 8

Gigabyte GeForce GTX 460 SOC review - Heat levels | Noise levels

by Hilbert Hagedoorn on: 11/04/2010 02:00 PM [ ] 0 comment(s)

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Graphics card cooler performance examined

Gigabyte GeForce GTX 460 SOCLet's have a look at the temperatures the custom cooler offers.

We now fire off a hefty shader application at the GPU and start monitoring temperature behavior as it would be when you are gaming intensely and continuously, we literally stress the GPUs 100% here, as you can see in the graph.

Below, an overview of peak / maximum measured temperatures in comparison with other cards. These temperatures with your average game will typically be lower.

This card ran 28 degrees C in IDLE and when stressed it reached 65 degrees C. The card is less warm compared to the reference model, even despite the very high default factory overclock.

We measure at a room temperature of 21 degrees Celsius. Above, a chart of this particular test.

 

Noise Levels coming from the graphics card

When graphics cards produce a lot of heat, usually that heat needs to be transported away from the hot core as fast as possible. Often you'll see massive active fan solutions that can indeed get rid of the heat, yet all the fans these days make the PC a noisy son of a gun. I'm doing a little try out today with noise monitoring, so basically the test we do is extremely subjective. We bought a certified dBA meter and will start measuring how many dBA originate from the PC. Why is this subjective you ask? Well, there is always noise in the background, from the streets, from the HD, PSU fan etc etc, so this is by a mile or two an imprecise measurement. You could only achieve objective measurement in a sound test chamber.

The human hearing system has different sensitivities at different frequencies. This means that the perception of noise is not at all equal at every frequency. Noise with significant measured levels (in dB) at high or low frequencies will not be as annoying as it would be when its energy is concentrated in the middle frequencies. In other words, the measured noise levels in dB will not reflect the actual human perception of the loudness of the noise. That's why we measure the dBA level. A specific circuit is added to the sound level meter to correct its reading in regard to this concept. This reading is the noise level in dBA. The letter A is added to indicate the correction that was made in the measurement. Frequencies below 1kHz and above 6kHz are attenuated, whereas frequencies between 1kHz and 6kHz are amplified by the A weighting.

TYPICAL SOUND LEVELS
Jet takeoff (200 feet) 120 dBA  
Construction Site 110 dBA  Intolerable
Shout (5 feet) 100 dBA  
Heavy truck (50 feet)  90 dBA  Very noisy
Urban street  80 dBA  
Automobile interior  70 dBA  Noisy
Normal conversation (3 feet)  60 dBA  
Office, classroom  50 dBA  Moderate
Living room  40 dBA  
Bedroom at night  30 dBA  Quiet
Broadcast studio  20 dBA  
Rustling leaves  10 dBA  Barely audible

There are a lot of differences in measurements amongst websites. Some even place the dBA meter 10cm away from the card. Considering that's not where you ear is located, we do it our way.

For each dBA test we close the PC/chassis and move the dBA gun 75 cm away from the PC. Roughly the same proximity you'll have a PC in a real-world situation.

We measured a perfectly silent 37 dBA when the GPU is massively under stress. This means that under normal circumstances, you cannot hear the product over the regular PC noise.

If your PC is in IDLE or you are working in desktop mode then dBA levels remain at 37 dBA, a noise level you will not be able to hear whatsoever either (of course).




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