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Windows 7: CPU

View Poll Results: Should a CPU Fan be intake or exhuast?
Intake 14 87.50%
Exhuast 2 12.50%
Voters: 16. You may not vote on this poll

24 Mar 2010   #121
546 Inspiron

Windows 7 home premium with 64 bit
 
 

Quote   Quote: Originally Posted by Dwarf View Post
The fan mounted on top of a heatsink should be blowing downwards onto it. You need the maximum air flow across the fins, and the only way is by positive air pressure. Indeed, if you have a case with a duct over the CPU/HSF assembly, it is not there to allow the warm air generated to exhaust the case - rather it is there so that the fan can pull cool room temperature air INTO the case and across the heatsink.

Try this (you will need an electric fan). With this analogy, the fan obviously represents the fan; your fingers the heatsink; and your body temperature the heat generated by the CPU. With the fan operating, stick both index fingers into some cold water. Hold them, one in front and one behind the fan at equidistant distances. Which finger feels colder? It should be the one that you held up in front, i.e. the one under positive air pressure.
Your anology doesn't hold any water because there is no shrouding. A shrouded fan would PULL cool air from the bottom and through the fins and expell it at the top where the case fan would pick it up (and out). And your fingers aren't in your computer case.


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24 Mar 2010   #122
546 Inspiron

Windows 7 home premium with 64 bit
 
 

Quote   Quote: Originally Posted by cloud8521 View Post
Quote   Quote: Originally Posted by CarlTR6 View Post
Thanks for sharing your results.
no problem, sorry i could not get pictures, when im tired im sometimes crazy
Thanks for the work and interest. I don't want you to test anymore but was there a shroud? It's all about the shroud.
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24 Mar 2010   #123
Phone Man

Windows 8.1 Pro w/Media Center 64bit, Windows 7 HP 64bit
 
 

Fascinating thread. I got curious so I opened my case and looked at my AMD CPU heat sink and the fan is blowing down toward the CPU. I then pulled a few copies of CPU and MaximumPC magazines and looked at the adds and pictures. In every case the fans were blowing toward the CPU or GPU on video cards. All the adds for after market HSF were setup the same way. So I have to believe that the manufactures have determined that blowing toward the chip is the best. It has been a good discussion and a lot better then "Which AV is Best????" Some disagreement but no one got shot

Jim
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25 Mar 2010   #124
cloud8521

 

Quote   Quote: Originally Posted by 546 Inspiron View Post
Quote   Quote: Originally Posted by cloud8521 View Post
Quote   Quote: Originally Posted by CarlTR6 View Post
Thanks for sharing your results.
no problem, sorry i could not get pictures, when im tired im sometimes crazy
Thanks for the work and interest. I don't want you to test anymore but was there a shroud? It's all about the shroud.
shrouds seems to be more problematic then helpful.
My System SpecsSystem Spec
25 Mar 2010   #125
Kipper

 

Wow, what a fun thread.

So, with a little different setup, the SilverStone FT02 chassis which has a 90 degree rotated motherboard placement and running aftermarket air cooling (CM Hyper212Plus) which cannot blow or suck air onto the CPU or away from the CPU I decided to mount dual 120mm fans one each side of the sink. One blowing and one sucking. I figure I have to have the right answer with this setup.

You guys are a blast, seriously a great thread.
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25 Mar 2010   #126
YTBOY83

Windows 7 64Bit Ultimate Edition SP1
 
 

Quote   Quote: Originally Posted by Kipper View Post
Wow, what a fun thread.

So, with a little different setup, the SilverStone FT02 chassis which has a 90 degree rotated motherboard placement and running aftermarket air cooling (CM Hyper212Plus) which cannot blow or suck air onto the CPU or away from the CPU I decided to mount dual 120mm fans one each side of the sink. One blowing and one sucking. I figure I have to have the right answer with this setup.

You guys are a blast, seriously a great thread.
Hey i like that idea, do you have a good exhaust fan at the back.????
My System SpecsSystem Spec
25 Mar 2010   #127
YTBOY83

Windows 7 64Bit Ultimate Edition SP1
 
 

My System SpecsSystem Spec
25 Mar 2010   #128
CarlTR6

Windows 7 Ultimate 32 bit
 
 

Quote   Quote: Originally Posted by Phone Man View Post
It has been a good discussion and a lot better then "Which AV is Best????" Some disagreement but no one got shot

Jim


Interesting; but not nearly as spirited as our discussion here!
My System SpecsSystem Spec
25 Mar 2010   #129
YTBOY83

Windows 7 64Bit Ultimate Edition SP1
 
 

I agree, i never knew that my thread would have so much response. I hope it is alive for a good few years yet.
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25 Mar 2010   #130
Kipper

 

Quote   Quote: Originally Posted by rmw020 View Post
Quote   Quote: Originally Posted by Kipper View Post
Wow, what a fun thread.

So, with a little different setup, the SilverStone FT02 chassis which has a 90 degree rotated motherboard placement and running aftermarket air cooling (CM Hyper212Plus) which cannot blow or suck air onto the CPU or away from the CPU I decided to mount dual 120mm fans one each side of the sink. One blowing and one sucking. I figure I have to have the right answer with this setup.

You guys are a blast, seriously a great thread.
Hey i like that idea, do you have a good exhaust fan at the back.????
The 90 degree rotating of the MB and the "positive air pressure" of this chassis is quite unique. All intake fans (3X180mm) are bottom mounted with one 120mm exhaust fan on the top of the case.

I wrote a review of this chassis for SilverStone which you can read here:

The SilverStone FT02 Case:
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