有關噪音的部分
computerbase的描述
http://www.computerbase.de/artikel/...itt_lautstaerke
windows下還算安靜,和系統其它聲音相比,可以忽略,
但一旦執行3d時就很驚人,很大聲,甚至5970都比它安靜,
風扇對loading轉換時很敏感,相當煩人,機殼空氣的流通相當重要

techpowerup
http://www.techpowerup.com/reviews/...0_Fermi/31.html
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.

On the previous page you read about the power consumption of the GeForce GTX 480. This should give you an expectation what you will see here. Basically all the power consumed by the card ends up as heat and that has to go somewhere.
In idle the fan noise is decent, but certainly not anywhere what we have seen on HD 5870s with custom cooling solutions from AIBs like PowerColor or ASUS . Under load the fan ramps up quickly to make you wish you had earplugs. Same picture here again: similar noise to NVIDIA's last generation cards, while AMD has worked on their noise levels and delivered substantial improvements.

NVIDIA's fan control profile is also set in a way that quickly ramps the fan up and down as load changes, resulting in a more audible experience since your brain tends to notice changing noise levels much more than a constant level.

在idle時還不錯,但無法和5870相比,
load時,風扇轉速快速切換,你會希望有個耳塞,
風扇急起急落,讓人很容易察覺,因人腦會注意噪音變化的改變


噪音感受度和使用環境有關,如果環境是屬於幽靜型的,
在最高負載風扇來到85%(4200rpm),溫度來到91~96度,
如果在夏季炎熱時,大抵只能開冷氣應對吧,
不然就算風扇100%也難保溫度不會破百…