Fan Noise

In the past years users would accept everything just to get more performance. Nowadays this has changed with people being more aware of the fan noise and power consumption of their graphic cards.
In order to properly test the fan noise a card emits we are using a Bruel & Kjaer 2236 sound level meter (~$4,000) which has the measurement range and accuracy we are looking for.


The tested graphics card is installed in a system that is completely passively cooled. That is passive PSU, passive CPU cooler, passive cooling on the motherboard and Solid-State HDD.
This setup allows us to eliminate secondary noise sources and test only the video card. To be more compliant with standards like DIN 45635 (we are not claiming to be fully DIN 45635 certified) the measurement is conducted at 100 cm distance and 160 cm over the floor. The ambient background noise level in the room is well below 20 dbA for all measurements. Please note that the dbA scale is not linear, it is logarithmic. 40 dbA is not twice as loud as 20 dbA. A 3 dbA increase results in double the sound pressure. The human hearing is a bit different and it is generally accepted that a 10 dbA increase doubles the perceived sound level.

Fan noise on the iGame GTX 460 does not seem to be optimized for the card design at all. The BIOS is configured to never run the fan below 40% - no matter how cool the card is. Under load the 40% fan speed is sufficient to never let the card reach a temperature at which the fan speed would be increased beyond 40%. Effectively this means that the fan speed will always be at 40%.

This results in a more audible than necessary experience. Given the unique Turbo button it would have been a really nice feature if the fan were super quiet in normal mode and a bit faster in turbo mode for higher overclocking - and properly track temperature in both modes.