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noise dB questions...

Micky Love
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Hey !

 

I was wondering how silent is silent ? 

What I mean is by now, my PC emit around 31dB, measured with a SPL meter, at 2" from the top of the case.

This is the idle noise and it's probably 2 dB or 3dB higher than the room sound.

 

Fans are turning at 700-800 RPM.

 

This is pretty good but I still heard it and I would like to try some silent fans...

If I replace my (2X 120mm intake AC F12 + 1X 120mm exhaust Corsair SP) fans

with the Noctua NF-S12B Redux 1200, will I be able to really heard a difference ?

 

The CPU fan is the stock CM Evo 212 fan, it's pretty silent so I will probably keep it,

unless there is a good reason to change it. I would have change it anyway if Noctua

were making some REDUX series enhance for static pressure... I like the grey REDUX

but I'm not gonna pay almost twice the price for that beige/brown color... yes, I know...

 

 

 

Thanks !

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Well dB is calculated as 10log( Intensity / Io) where Io is the reference intensity which is 10^-12 W/m^2 Intensity is a measure of power/ area.  So a silent fan would need to be on the order of 10^-11 W/m^2 aka 10dB.

CPU: Intel 3570 GPUs: Nvidia GTX 660Ti Case: Fractal design Define R4  Storage: 1TB WD Caviar Black & 240GB Hyper X 3k SSD Sound: Custom One Pros Keyboard: Ducky Shine 4 Mouse: Logitech G500

 

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yes, noctua fans at 1200rpm are much quieter than AC and corsair fans

cant really give you numbers since loudness is relative to each person, but I noticed a big difference between 25db AC and corsair fans and 15-20db fans

NEW PC build: Blank Heaven   minimalist white and black PC     Old S340 build log "White Heaven"        The "LIGHTCANON" flashlight build log        Project AntiRoll (prototype)        Custom speaker project

Spoiler

Ryzen 3950X | AMD Vega Frontier Edition | ASUS X570 Pro WS | Corsair Vengeance LPX 64GB | NZXT H500 | Seasonic Prime Fanless TX-700 | Custom loop | Coolermaster SK630 White | Logitech MX Master 2S | Samsung 980 Pro 1TB + 970 Pro 512GB | Samsung 58" 4k TV | Scarlett 2i4 | 2x AT2020

 

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Well dB is calculated as 10log( Intensity / Io) where Io is the reference intensity which is 10^-12 W/m^2 Intensity is a measure of power/ area.  So a silent fan would need to be on the order of 10^-11 W/m^2 aka 10dB.

ehhhhhhhhhhhhh ok...

 

Thanks 

 

yes, noctua fans at 1200rpm are much quieter than AC and corsair fans

cant really give you numbers since loudness is relative to each person, but I noticed a big difference between 25db AC and corsair fans and 15-20db fans

 

Ok perfect, that's the kind of answer I was looking for...

 

Thanks !

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ehhhhhhhhhhhhh ok...

 

Thanks 

 

 

Ok perfect, that's the kind of answer I was looking for...

 

Thanks !

you're welcome :)

NEW PC build: Blank Heaven   minimalist white and black PC     Old S340 build log "White Heaven"        The "LIGHTCANON" flashlight build log        Project AntiRoll (prototype)        Custom speaker project

Spoiler

Ryzen 3950X | AMD Vega Frontier Edition | ASUS X570 Pro WS | Corsair Vengeance LPX 64GB | NZXT H500 | Seasonic Prime Fanless TX-700 | Custom loop | Coolermaster SK630 White | Logitech MX Master 2S | Samsung 980 Pro 1TB + 970 Pro 512GB | Samsung 58" 4k TV | Scarlett 2i4 | 2x AT2020

 

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ehhhhhhhhhhhhh ok...

 

Thanks 

Well you did ask how silent is silent, the answer is 10^-12 W/m^2 , dunno don't ask... 

CPU: Intel 3570 GPUs: Nvidia GTX 660Ti Case: Fractal design Define R4  Storage: 1TB WD Caviar Black & 240GB Hyper X 3k SSD Sound: Custom One Pros Keyboard: Ducky Shine 4 Mouse: Logitech G500

 

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