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Old January 23, 2009, 05:12 AM
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Originally Posted by Eagle Eye View Post
28-19.8 = 8.2 dba louder, but the Noctua is $15.00 dollars more.

EE
Vapor, the admin at XS has done a few fan round-ups, and his results show that a D12SL-12 Yate Loon and the Noctua P12 are about the same in open air, but the D12SL-12 dominates when static pressure is required such as on a heatsink or rad.

Here is a link to the review (that I seem to always be linking every time people are saying that P12 are better than D12SL-12s) Fan Mini-Review: Fan Roundup 3 Begins - XtremeSystems Forums
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Old January 23, 2009, 11:21 AM
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Just keep in mind that as a general rule of thumb, a 10dB difference is roughly a factor of 2 of perceived loudness. That is, 60dB is not twice as loud as 30dB but 2*2*2 = 8 times louder. This is because the decibel scale is logarithmic. Also note that two 30dB fans are not producing 60dB of sound output; again because of the logarithmic scale. I don't know the calculation off hand but I'm sure there are some tools on the web that can add decibels for you.

So if you trust the manufacturer rated dB levels, then you can make a rough comparison with the fans that you currently have in your case. I don't really have much experience with different brands of fans, but that's what I'd do if I were to replace my fans (120mm antec tri-cool, 140mm tri-cool, 2x yate-loon D12SL).

Hope this helps.
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Old January 23, 2009, 12:14 PM
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Originally Posted by Skruch View Post
Just keep in mind that as a general rule of thumb, a 10dB difference is roughly a factor of 2 of perceived loudness. That is, 60dB is not twice as loud as 30dB but 2*2*2 = 8 times louder. This is because the decibel scale is logarithmic. Also note that two 30dB fans are not producing 60dB of sound output; again because of the logarithmic scale. I don't know the calculation off hand but I'm sure there are some tools on the web that can add decibels for you.

So if you trust the manufacturer rated dB levels, then you can make a rough comparison with the fans that you currently have in your case. I don't really have much experience with different brands of fans, but that's what I'd do if I were to replace my fans (120mm antec tri-cool, 140mm tri-cool, 2x yate-loon D12SL).

Hope this helps.
If one fan's noise level is 30db, adding another one will total 33db.
An increase of 3db doubles the "noise power" (dbW), but will not double the perceived loudness;
To double the perceived loudness, you'd need to use 4 fans instead of just 1.


Imagine for an instant that you would add 30db for each added fan:
1 fan = 30db
2 fans = 60db
3 fans = 90 db
4 fans = 120db.

A 120db sound level is extremely loud and dangerous.
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Last edited by Gellidius; January 23, 2009 at 12:22 PM.
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Old January 23, 2009, 03:30 PM
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4 fans are not going to sound louder than a chainsaw... lol, i've got 12 fans throughout my case.. i does not sound near that noise level.
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Old January 23, 2009, 07:12 PM
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Quote:
Originally Posted by Skruch View Post
Just keep in mind that as a general rule of thumb, a 10dB difference is roughly a factor of 2 of perceived loudness. That is, 60dB is not twice as loud as 30dB but 2*2*2 = 8 times louder. This is because the decibel scale is logarithmic. Also note that two 30dB fans are not producing 60dB of sound output; again because of the logarithmic scale. I don't know the calculation off hand but I'm sure there are some tools on the web that can add decibels for you.
While perceived loudness isn't the same as the actual sound energy that the dB scale deals with, I'm pretty sure that 10dB equals more than just twice the loudness. The sound energy goes up by a factor of 10, and I can vouch that there's a huge difference between 30dB and 40dB. Certainly more than just 'twice' as loud.
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Old January 23, 2009, 08:20 PM
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You haven't heard loud until you've heard these:

NCIX.com - Buy Delta 120MMX38MM Case Fan Dual Ball Bearing 4600RPM 220CFM 65DBA - TFB1212GHE-F00 In Canada.


Here's a small sound byte:
YouTube - Fan Comparison
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Old January 23, 2009, 08:58 PM
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strange... yate-loon has 47cfm? i thought it has about 75cfm...

my zm-f3 has 20/34 dba, 900/1800 rpm, 37/76 cfm... so i bet its best one


ps. phobia... can your computer fly?
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Old January 23, 2009, 09:22 PM
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You can't take manufacturer ratings too seriously. They're notorious skewed/inflated. And YL fans come in a huge range of speeds, resulting in cfm ratings anywhere from the low 30's to 100+.
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Old January 23, 2009, 09:40 PM
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Quote:
Originally Posted by death_hawk View Post
You haven't heard loud until you've heard these:

NCIX.com - Buy Delta 120MMX38MM Case Fan Dual Ball Bearing 4600RPM 220CFM 65DBA - TFB1212GHE-F00 In Canada.


Here's a small sound byte:
[CUT]
You haven't heard that fan until you've heard it in person. You have to raise your voice to talk over it. Even at 5V its louder than my entire PC (6 Yate Loon D12SL-12's and 2 ZM-F3's, all at around 10-11V). I do remember quite vividly, the first time I plugged it in. The same thing happened, except it landed on my leg. Luckly the blades were facing away from my leg, so it just blew it self off until it was hanging by the wire. Pretty exciting introduction to a fan.
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  #30 (permalink)  
Old January 24, 2009, 05:28 PM
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You think ONE is loud... try listening to FOUR of them.
I have 4 of them on a GT Xtreme 480 and man does it BLOW! And I mean BLOW!

And about it flying off the table... does this look familiar?

YouTube - Delta TFB1212GHE


Oh and I was recently bit by a Panaflo at 120CFM and it ing HURT! I was actually bleeding pretty good.

The Deltas are the only fans I put fan grills on. They are SERIOUSLY dangerous.
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