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Is 100% air cooled silent overclocked PC possible? - Page 5

post #41 of 87
Quote:
Originally Posted by doyll View Post

No, no, no. In a 21-23dB sound level room adding a 20dB sound source we end up with a 24-25dB sound level .

When we add 41-43dB sound source to a 21-23dB sound level room we get a 41-43dB sound level.
http://www.sengpielaudio.com/calculator-spl.htm

Fan rating is open air. Our use is not open air. Our sound levels are generally higher than rated levels.

Gotcha so i put in 22db 10x and got about 32db, adding 2 more will probably be around 33db. My fans arent rated at 22 but like you said theyre not open air, 3 are intakes up top 2 fronts go thru a rad 3 bottoms go thru a rad and 3 bottoms pull, my rear exhaust is at a lower rpm so didnt even do that i juts put all 10 at 22 haha.

My meter reads 23db nothing on, 40-41 with the pc on and about 50db or so when typing on my mech keyboard. So no clue what that 32db from the calculator means cuz for me 32db over ambient noise would be what my r9 390 did with its stock cooler with my fan curve.

All i know definitively is that i was at around 50db or so (meter reading) with 2 intake fans and 2 exhaust fans on my old case while gaming. Now with more fans and on water im at 41db. Make of it what you will good sir thumb.gif
    
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post #42 of 87
@bluej511, may I ask what sound meter you have? I'm curious because mine starts reading at about 28dB. I would love to have one that starts reading at lower levels, but haven't found one at a reasonable price.
post #43 of 87
If you tune the performance according to your noise volume preference levels, you solve the problem altogether.
First, select how fast your cpu fans and such should move air until they become disturbingly audible. Second tune your hardware, such that the cooling performance is always on top of the heating element. I use P95 and only test for L1 16k since the thermal diodes look for the elevations in core temperature and so long as those core temperatures next to L1 caches are kept in check during the testing stage, the heating element never exceeds your cpu cooling during normal operation. You make cutbacks at this level until the cpu heating becomes level with the cooling, I had to cut back 100MHz until the test would finalize with verification.
Third, create a gpu fan profile. I noted down my gpu fan profile's rpm levels and since the increase in air displacement is proportionate to those rpm increments, the final result turned out very different than the stock percentage profile. The default is not tuned at all, the rpm levels turned out to be totally disproportionate to the percentage levels. The closest profile with which I could get to a perfectly linear slope was 41-43-45-48-51-55-61 at 4 degrees between each. The sound profile is indistinguishable since it always increases the same amount at each step and not by unaccustomed amounts between each other consecutive level.
Edited by mtcn77 - 6/3/16 at 2:21am
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post #44 of 87
Quote:
Originally Posted by doyll View Post

@bluej511, may I ask what sound meter you have? I'm curious because mine starts reading at about 28dB. I would love to have one that starts reading at lower levels, but haven't found one at a reasonable price.

This is the one im using that ive had forever. I use my galaxy s4 to measure as i have it calibrated the same as the sound meter, gives me the same rating for my pc fan noise though. It might have been damaged while moving though cuz its never read below 30 before so not sure. The Fonesco goes from 23 to 41 and the s4 goes from 30 to 47db or so, so i dont use the db meter often anymore i think its screwy but my s4 was calibrated using it years ago (its pretty much a 600$ measuring device at this point doesnt recognize the sim card anymore)

http://www.amazon.com/dp/B01A81RLYI?psc=1

So yea that 23db might be inaccurate but the noise level of +20db is still fairly accurate. You should hear the stock cooler at 60% speed it was doing 2800rpm its why i went to the dark side.
    
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post #45 of 87
Quote:
Originally Posted by bluej511 View Post

This is the one im using that ive had forever. I use my galaxy s4 to measure as i have it calibrated the same as the sound meter, gives me the same rating for my pc fan noise though. It might have been damaged while moving though cuz its never read below 30 before so not sure. The Fonesco goes from 23 to 41 and the s4 goes from 30 to 47db or so, so i dont use the db meter often anymore i think its screwy but my s4 was calibrated using it years ago (its pretty much a 600$ measuring device at this point doesnt recognize the sim card anymore)

http://www.amazon.com/dp/B01A81RLYI?psc=1

So yea that 23db might be inaccurate but the noise level of +20db is still fairly accurate. You should hear the stock cooler at 60% speed it was doing 2800rpm its why i went to the dark side.
so a meter (mine is same with USB interface so can record data and graph in real time) with measurement range of 30 dB to 130 dB (+/- 1.5 dB) is giving you 23dB readings you are posting. doh.gifbuttkick.gif

How can you expect me to believe anything you are posting when your are not giving us accurate data? poke.gif

You can tell the truth a million times and people believe most of what you say, but tell a falsehood once and no-one will believe anything else you say. helpinghand.gif
post #46 of 87
Quote:
Originally Posted by doyll View Post

so a meter (mine is same with USB interface so can record data and graph in real time) with measurement range of 30 dB to 130 dB (+/- 1.5 dB) is giving you 23dB readings you are posting. doh.gifbuttkick.gif

How can you expect me to believe anything you are posting when your are not giving us accurate data? poke.gif

You can tell the truth a million times and people believe most of what you say, but tell a falsehood once and no-one will believe anything else you say. helpinghand.gif

Yea odd never done it before, tried it with the s4 and 30db ambient noise giving my pc about 48db reading. Still a +18db from dead silent room to pc on so thats not changed. The meter is reading 23-41 the app calibrated is reading 30-48 so still the same amount of "noise".

(damn those brits are so picky and precise, when did you guys become zee german biggrin.gif)
    
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post #47 of 87
Quote:
Originally Posted by bluej511 View Post

Yea odd never done it before, tried it with the s4 and 30db ambient noise giving my pc about 48db reading. Still a +18db from dead silent room to pc on so thats not changed. The meter is reading 23-41 the app calibrated is reading 30-48 so still the same amount of "noise".

(damn those brits are so picky and precise, when did you guys become zee german biggrin.gif)
18dB increase is almost 4 times as loud to our ears. wink.gif
Me grandmothers and grandfather were from motherland, other grandfather was English/Irish. Brown hair and eyes, so none of zee blondee blue eye stuff here. biggrin.gif
post #48 of 87
Quote:
Originally Posted by doyll View Post

18dB increase is almost 4 times as loud to our ears. wink.gif
Me grandmothers and grandfather were from motherland, other grandfather was English/Irish. Brown hair and eyes, so none of zee blondee blue eye stuff here. biggrin.gif

Idk thats what i get from the meter. If i compare it to my surround sound system that would hit 100db on the meter (when it was new) without breaking a sweat, that was a 7.1 Klisch speaker with a Velodyne 12in sub. How many times to the ear is that haha.

With the windows open i dont hear it at all, while gaming, again inaudible over the speakers, hell even just typing this post with the window closed i hear the keyboard over the fans. Id record it but it would come out sounding like crap and not a true representation. Take that ferry over and find out for yourself biggrin.gif
    
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post #49 of 87
Of course it is possible. Just expensive.

Good quality fans cost a lot.

I just ordered 2 Noctua fans and it cost me $25 and $27 for the 2 + 13% tax. Pricey.
post #50 of 87
liquidmetalpaste
You may be able to use less fans or lower rpm with these.
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