噪音有時是很主觀的,就如同所有事件一樣,
除非到了一個程度,大家都覺得吵,
如果處在”混沌區”,
可能會依每個人的聽覺敏銳度及心理感受度之不同而產生差異,
有人覺得吵得要死的風扇反而有些人覺得一點都不吵,
並不是因為聽不到,而是心理層面能夠釋懷,
有些人只要聽到一點聲音就受不了,
屬於”心理加權噪音”,當然,感受百分比因人而異~~

底下連結有20幾個測試4870x2的網站,
http://forums.techpowerup.com/showthread.php?t=68238
大致瀏覽了一下,有對噪音評比的並不多,
泰半可能用文字來描述,少數可酌供參考如下
tom’s hardware
http://www.tomshardware.com/reviews...amd,1992-8.html

Reasonably silent at rest, the RadeonHD 4870 X2 turns out to be—not surprisingly—quite noisy when in use, right from the time that its fan starts spinning up. On the other hand, we also want to note that while the GeForce GTX280 is pretty noisy at rest, it is much more bearable than it used to be under load.

Tech powerup
http://www.techpowerup.com/reviews/...4870_X2/25.html


In idle AMD's card is very quiet and a pleasant experience to work with when you are not using 3D. Under load however, the card's fan ramps up quickly, but still doesn't reach the leaf blower levels of the HD 2900 XT. Still, it is what I would definitely consider noisy.
I would also like to mention the electric coil noise coming from the card when running under high load. It is not annoyingly loud but can still be heard over the whole system when running with some serious 3D load.

夏天大家習慣開電風扇、空調,
也會影響對電腦產生的噪音值判斷,
到了冬天突然發現電腦變吵了,
尤其在週邊環境安靜的時候,
但冬天因為溫度低,溫控風扇轉速可能降低了,
也減少了部分的噪音源~~