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Got my SilenX's up on my GTX480 (not good!) - Page 6

post #51 of 54
...anyway, that amount of SilenX combined will be loud either way. dBa adds up you know.
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post #52 of 54
Thread Starter 
ummm just so you know, dBA adds up, but in a logarithmic scale,
if you have 3 x 30 dBA fans, your not going to get 30+30+30= 90dBA!!

Quote:
if I recall, bels are log10(sound energy) - that is, a sound 1 bel louder has 10 times the sound energy (and "sounds" about twice as loud.)

40 dB = log10(X), X units of sound energy.
30 dB = log10(X)-1 = log10(X/10), X/10 units of sound energy.

add them you get X * 1.1 units of sound energy.

log10(X*1.1) = log10(X)+log10(1.1) = 40 dB + 0.041 dB = 40.04 dB

so yes the loudest sound very much dominates. Adding a 30 dB sound source to a 40 dB sound source would be completely unnoticeable.
source:
http://www.ocforums.com/showthread.php?t=321286

So my point, it doesnt add up as much,so its not the add up thats making the noise,
its the fans itself.1 or 4. still noisy!


Here is a cool program to calculate the amount of dBA your getting, you have to know the dBA of each fan though.

http://www.overclockers.com/tips1129/

Fan Noise Utility
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post #53 of 54
Hey thats a good one I never saw that there...The fan noise utility that is...
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post #54 of 54
haha yea, the silen-x arent quite as good as they are advertised to be, and theyre only like 70 cfm

i just got two Panaflo for $5.99 ea and i love them!
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