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[Build Log] The BMW/Corsair 645i ($3000, BMW and all the good stuff) *56k Warning* - Page 15

post #141 of 522
Quote:
Originally Posted by barkinos98 View Post

how do i measure/calculate the noise level of my rig?
i'm sure i dont add all the dBa of the fans biggrin.gif

im asking because my mac supposedly goes up to 44dBa under full load (im talking 92C core temps, 6200rpm from a very small fan) and that makes it just unbearable.
is something below 30 asking too much?

Decibels are logarithmic. +3dB = x2, since 10*log(2) ~ 3 assuming base 10.
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post #142 of 522
Thread Starter 
Quote:
Originally Posted by Sunreeper View Post

You're using the scythe fans correct?
yeah, 2 scythes, one AF120 and one stock 200mm fan at the front thumb.gif
also GTX780 fan, and possibly H100i pump noise.
Quote:
Originally Posted by TheBlademaster01 View Post

Decibels are logarithmic. +3dB = x2, since 10*log(2) ~ 3 assuming base 10.
and yes i am barkin

what is a logarithm?
     
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post #143 of 522
Quote:
Originally Posted by barkinos98 View Post

yes yes
i'll purchase a case from overseas and try to hide it in my baggage rolleyes.gif
and no way jose, i would go 3930K because mobo is cheaper by a very substantial amount when dropped to R4G; compensates the price.

and ATX builds are hard to keep silent because its bigger=more place for stuff to wiggle=more noise
and and and
bigger=more slots for fans=more fans=more sound

i feel like giving in to the rig thing, this took too much time than it should.
Any reasonable case will not have this problem.
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post #144 of 522
Thread Starter 
600T im thinking of?
it seems a very easy case to work wiht all around, so yeah biggrin.gif
im going to get it wrapped in a color i like, then i'll go on with that. i've spent too much time trying to decide a motherboard.
     
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post #145 of 522
Quote:
Originally Posted by barkinos98 View Post

yeah, 2 scythes, one AF120 and one stock 200mm fan at the front thumb.gif
also GTX780 fan, and possibly H100i pump noise.
and yes i am barkin

what is a logarithm?

It is the reciprocal function of a power of the base (in this case 10)

So 10^3 = 1000. log(1000) = 3

10^2 = 100. log(100) = 2

2*1.5 = 3

100*1.5 != 1000

log(x) basically says to what power to I need to raise 10 in order to get x. log can also mean base e which means, to what power do I need to raise e in order to get x

So log(e) with base e = 1 since e^1 = e.
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post #146 of 522
Thread Starter 
Quote:
Originally Posted by TheBlademaster01 View Post

It is the reciprocal function of a power of the base (in this case 10)

So 10^3 = 1000. log(1000) = 3

10^2 = 100. log(100) = 2

2*1.5 = 3

100*1.5 != 1000

log(x) basically says to what power to I need to raise 10 in order to get x. log can also mean base e which means, to what power do I need to raise e in order to get x

So log(e) with base e = 1 since e^1 = e.

ah, thanks!

last question: how do i use this to calculate my noise levels? biggrin.gif

Also 2x2TB drives in RAID0 or a single 4TB drive solely for storage?
Edited by barkinos98 - 7/7/13 at 5:02pm
     
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post #147 of 522
Quote:
Originally Posted by barkinos98 View Post

ah, thanks!

last question: how do i use this to calculate my noise levels? biggrin.gif

Also 2x2TB drives in RAID0 or a single 4TB drive solely for storage?

You sum them up logarithmically.

Let's say you have 33dB + 40dB + 29dB.

You get 10*log(10^(33/10) + 10^(40/10) + 10^(29/10))

Because

noise level [dB] := 10*log(power), power = 10^(noise level[dB]/10)
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post #148 of 522
Thread Starter 
Quote:
Originally Posted by TheBlademaster01 View Post

You sum them up logarithmically.

Let's say you have 33dB + 40dB + 29dB.

You get 10*log(10^(33/10) + 10^(40/10) + 10^(29/10))

Because

noise level [dB] := 10*log(power), power = 10^(noise level[dB]/10)

so, after some trying with my TI-84, it should be something like: 41.07dB
and wow that is too much, i hope that wasnt using real values frown.gif
i'll calculate the real deal when im not living on caffeine (NOT 3am)
     
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post #149 of 522
Although TheBlade is certainly correct - there's a much easier way to calculate assuming that the timbre of the sound is similar (i.e. the tone - whine or whoosh, etc..):

You will only hear/notice the highest SPL emitted in most instances... so even if you have 10 25db sound sources - if you have just 1 45db sound source - your system will appear to you to have a noise level of 45db. Because the other noise is so much lower it will get filtered out by your brain much more easily.

However, the bottom line is that if noise is most important to you (i.e. you've already stated that you won't be benching, the OC isn't as important, and you only want to play a couple games, etc.) then you would be far better off going with slightly lower-end, cheaper components - and watercooling everything.

By way of example, my sig-rig has ~14 120mm fans in it, 2 GPUs, and a CPU that will run circles around a stock-clocked 3930K in everything but the most heavily multi-threaded apps. Yet it's measured sound levels are 32db from 12in away (and it's completely inaudible from my chair)... because all of those fans run <900RPM on 1080mm of radiator space... biggrin.gif

Sure, for the same money I could be running something much more "impressive" than a 3770K on a Z77 board... but then I'd have to run something air cooled... and it would be much, much louder!

EDIT: Oh and if you want to know how you measure the noise - you simply need one of these (or if you have a smartphone/tablet with a good mic on it... there are free/cheap apps that can do the same thing).
Edited by DiGiCiDAL - 7/7/13 at 5:29pm
post #150 of 522
Well, yeah the 40dB noise generating source would level things up a bit.

If you've got two 33dB fans, the noise becomes 36dB

Since 33dB + 33dB = 2*33dB = 3dB + 33dB (since 10*log(2) ~ 3). That makes dB easy, amplification.

For each double you get +3dB

So 4x 33dB fans = 39dB and 8x 33dB fans = 42dB

Though I'd figure vibration and harmonics will play a bigger part at that point.
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