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Need to replace top fans in a Lian Li PC-B25F. Some RPM quesitons

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December 22, 2009 3:29:22 PM

Currently the case (Lian Li PC-b25F) has 2 x (140mm x 25mm) top fans with 1000RPM 3-Pin Connector with RPM sensing.

I can only choose between 900RPM or 1200RPM for the replacement fans (1000 not offered), which RPM should I go with?
These are also 3-Pin Connector with RPM sensing.

CASE Specificaitons:
http://www.lian-li.com/v2/en/product/product06.php?pr_i...

The replacement fans (with Blue LEDs) that I'm looking at are:

Lian Li 140x25mm, Blue LED (CF-1409A) - 900 RPM
http://www.performance-pcs.com/catalog/index.php?main_p...

or

Lian Li 140x25mm, Blue LED (CF-1412A) - 1200 RPM
http://www.performance-pcs.com/catalog/index.php?main_p...

The Acoustical Noise for both fans are the same at 26.95dBA (Max 27.6dBA)

Thanks

Mark
December 22, 2009 4:19:49 PM

I'm using the red CF-1412A in K-62. It's pretty quiet.
The stock ones were the blue CF-1409A
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December 22, 2009 5:04:29 PM

Thanks masterasia,

The stock ones are 1000 RPM not LED though.

I was just wondering if I should get the blue LED with 900 or 1200 RPM?
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December 25, 2009 11:27:02 AM

So should I go with the 900 rpm fans rather then the 1200 rpms as 900 is closer to the 1000 rpm that it comes with? I want good cooling but also want to keep the noise down.

Merry CHRISTmas
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a c 248 ) Power supply
December 25, 2009 12:22:44 PM

Mark - Have you taken any sort of thermal measurements with the stock cooling fans? Why do you want to replace the stock fans? Want a little color?

If you don't mind a little extra noise go with 1200 rpm fans. That's pretty much the sweet spot.
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February 26, 2010 3:41:14 PM

Hi Mark_K,

I read your post about Li PC-b25F inner fans,
I'm going to buy this case or Coolermaster cm840 with 23" fans.
deciding for who of those cases have the in stock silent fans..

from your side the b25f fans are silent? less than 20 db?

thanks a lot for your reply

David
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a c 275 ) Power supply
October 4, 2010 1:06:24 AM

If you want quiet 140mm fans Thermalright and Scythe fans are better then Noctua's and cost about half the price.
Thermalright TR TY-140 140mm x 160mm PWM Fan - 900R~1300PM (Standard 120mm Fan Mount)-$14.99
http://www.frozencpu.com/products/11677/fan-755/Thermal...
Scythe Kaze Maru 2 Slip Stream 140mm x 25mm Fan (120mm Mount) - 1200 RPM (SM1425SL12M)-$13.99
http://www.frozencpu.com/products/10218/fan-662/Scythe_...
There's a reason the TR is out of stock it's the best 140mm fan made period 20db.
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October 4, 2010 1:28:29 AM

The scythe 140mm only fit in 120mm holes.

I need the 140mm hole fan frame.
I just ordered 2 Noctua NF-P14 Flx fans for a total of $49.00 delivered.
These have 140mm hole adaptors.

I hope I did the right thing by ordering these?

Thanks

Mark
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