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 Post subject: Fans Airflow
PostPosted: Thu Jan 27, 2005 10:18 pm 
Thunderbird
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Am I gonna see a big temp. difference if I buy a fan that has 30 or more CFMs?
Im talking like 120mm fans, cause I just bought one this is rated for 77 CFM but Ive seen some online that are around like 110 CFM.
I know they arent large purchases but was just wondering.


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 Post subject:
PostPosted: Thu Jan 27, 2005 11:39 pm 
Team Member
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yeah ull see a sizeable difference, mabey 3-5c drop in case temps if u got a hot running system


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PostPosted: Fri Jan 28, 2005 12:09 am 
Boy in Black
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:p :p :p

Now, you would if you were going from 25CFM to 55CFM. But at that high of a flowrate, it's neglible to increase that much. Less so if the Heatsink itself isn't efficient enough to even remove that much heat per minute.

Consider a car moving a 25 then increasing to 55. Fast eh? How about a car going 600MPH, then going 630MPH...not so big anymore is it?

77CFM is a LOT of airflow. Considering that average is in the 35CFM range.


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PostPosted: Fri Jan 28, 2005 6:23 am 
Thunderbird
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Thats what I was thinking Chumly, that after already moving that much air theres not gonna an increase like that wont be that noticable.
Just to let you know Im not talking about a HS fan but a case fan.
Also, how am I to be sure the direction of airflow?, theres no indicator.


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PostPosted: Sat Jan 29, 2005 2:53 pm 
8086
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there should be an arrow on the fan showing the direction of flow.

Even if theres no indicator, just look at the blades. They will scoop air, so just figure out wich direction the fan is supposed to spin, then figure out which way to point the fan based ot the blades from there...


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PostPosted: Sun Jan 30, 2005 10:59 pm 
Boy in Black
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Ya, there should be a pair of small arrows on the diameter. One points the airflow direction, the other points the rotations orientation...like that part matters.

In case fans, it may be worth a larger fan rather than faster. CFM is nice is nice in a case, as it translates to volume. I'm an advocate in the use of "air slugs" and "air streams" to demonstrate cooling conditions in a case. If you can make a good path of air (like a jetstream), it'll do more good than a high count of fans. But if you have that jetstream setup and can get more in that stream AND still maintain it...more power to ya.

I like big fans in the rear. Maybe just one big 120mm. Then the fronts just have to dump it in. The rear fan will direct the input and is usually close to the CPU and the AGP/PCIex16 slot where it's needed. A huge intake will just put a lot of air in there and not really do more than that.

Anyway, I'm rambling. If you can get 70cfm under control, it'll be more than enough to move a nice slug of air over your goodies. No, not THOSE goodies....Pervert.


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