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What to look for in a CPU cooling fan

post #1 of 5
Thread Starter 
I am looking for a fan to pair with the TRUE I am planning to get. I am thinking about many fans, actually. The Silverstone FM121, the Scythe "Slipstream", the Scythe S-Flex SFF21F, the Sanyo Denki Ace 120, Nexus, and others. Which one should I get? I have heard a lot about different ways to rate fans such as static pressure, CFM, and speed. What does all this mean? What is static pressure? How does it affect the performance of a CPU cooler? Is the advertised CFM even close to what I can acheive with low noise? BTW, I want the fan to be as quiet as possible while still being able to run a Q6600 overclocked to 3.2-3.6GHz 24/7. Thanks for the help.
post #2 of 5
The static pressure is related to the depth of the fan (38mm produce more than 25mm). It is beneficial because it means the fan is better at pushing air through smaller spaces as opposed to one with less static pressure - ideal on a tight fin spacing like the Thermalright Ultra 120 Extreme.

CFM - Cubic Feet per Minute, or the amount of air the fan actually pushes at a given RPM (usu. max)

The more air it can push through the cooler in a given time period the better (up until a point, usually around 100CFM). Some manufacturers give you the max RPM, max CFM, and max decibel rating for that fan. However some manufacturers (SilenX, for one) don't provide accurate readings on their fans and mislead customers intentionally.

With all that being said, I would recommend a 38mm Panaflo (aka Rexus, NMB-MAT), for the following reasons:

1) Even on high speed, the pitch of the 38mm deep fan is low enough where it won't hurt your ears.
2) Higher static pressure - ideal.
3) Open-eared corners, aka no modification to attach it to the Ultra 120 Extreme, unlike the Silverstone FM121.

If the noise bothers you (103CFM Panaflo, 86.5CFM Panaflo), you can always attach it to a fan controller, but you can do this to any fan, so it's a moot point.
R'lyeh
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R'lyeh
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post #3 of 5
I look for high CFM, a 3-pin PWM connector, and a subtle look (read: no LED).

For that reason, I chose the Scythe Slipstream 1900RPM (110CFM)
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post #4 of 5
Thread Starter 
Okay. Cool. I think the Panaflo looks good, but how about the slipstream? how about the denki ace 120?
post #5 of 5
Quote:
Originally Posted by cyborg939 View Post
Okay. Cool. I think the Panaflo looks good, but how about the slipstream? how about the denki ace 120?
Panaflos are known for excellent performance, and being insanely loud. Good fans, but you'd probably save money and hassle getting the Scythe.. Remember that a lot of the time Panaflo fans are sold without tails.
HP Pavilion dm1z
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HP Pavilion dm1z
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