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Tator Tot's Big "Quiet" 120mm & 140mm Fan Round-Up - Page 24

post #231 of 2699
Quote:
Originally Posted by Tator Tot View Post

I'll need a slow-motion camera and the entire Mythbusters crew for that one. thumb.gif

That would make this thread an instant epic win! tongue.gif
*Even more than it already is biggrin.gif
post #232 of 2699
Quote:
Originally Posted by Namwons View Post

i would love to see some tested results for my fans Tator Tot. Akasa Viper and also the Apache and the new Piranha fans

Oh God!! Nothing takes a finger as well as a circular saw but I bet these give them a run for their money.
    
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post #233 of 2699
Those Piranha fans are probably sleeve bearings. I have never seen and fdb bearing with a life span of only 50,000 hours.
post #234 of 2699
Thread Starter 
Quote:
Originally Posted by Vlodaf View Post

Those Piranha fans are probably sleeve bearings. I have never seen and fdb bearing with a life span of only 50,000 hours.

 

Could be a miss-print as well.

 

The HDB Apache & Viper fans are actual HDB bearings. They are all rated at 50k Hours.

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post #235 of 2699
Doesnt the mtbf always depend on the index'ed temperature?
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post #236 of 2699
Thread Starter 
Quote:
Originally Posted by Elohim View Post

Doesnt the mtbf always depend on the index'ed temperature?

 

Yep, but when the MTBF doesn't have a temp listed, it's best assumed that the temperature is 25*C.

 

25*C MTBF on a FDB fan should be 300k/hrs.

 

50k/hrs @ 25*C = Sleeve Bearing

65k/hrs @ 25*C = Rifle Bearing

95k/hrs @ 25*C = Ball Bearing

130k/hrs @ 25*C = 2 Ball Bearing

150k/hrs @ 25*C = Hydro Dynamic Bearing

 

 

That's just an average of what most companies rate at.

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post #237 of 2699
I guess we'll need you to test them for us then wink.gif If they are actual HDB bearings it would be interesting to see if those serrated blades actually work (I believe the Noctua's use a similar technique don't they?)
post #238 of 2699
Thread Starter 
Quote:
Originally Posted by Valida View Post

I guess we'll need you to test them for us then wink.gif If they are actual HDB bearings it would be interesting to see if those serrated blades actually work (I believe the Noctua's use a similar technique don't they?)

 

Noctua, Gentle Typhoons, Delta, Panaflo, & more.

 

It's a common technique. Just like stator-veins, to increase the airflow and centralize it into a single direction.

 

Personally, I like Silver Stone's Air Penetrator design. Since it follows the basic design of your typical box fan but it adds the least amount of noise and doesn't really effect the pressure.

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post #239 of 2699
Thanks for the testing and work Tator Tot.
I definitively look forward to the results of the rest of the fans. As I am looking for quieter fans but same performance if not better than the Yate Loon 120mm HS fans I have. (Mine are from SVC.)

Rebelord
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post #240 of 2699
Out of curiosity, why aren't SilenX fans in many of these roundups? I'd love to see how the large/thick Ixtrema series with the conical centers compared in CFM, static pressure and noise. Is it their cost, or is it something I don't know about them?
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