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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   #101
YTBOY83

Windows 7 64Bit Ultimate Edition SP1
 
 

I have noticed a small difference with the cpu fan set as exhaust, it seems to be more cooler in idle state, i shall try it like this for a few days and see if i have any more difference guys.


My System SpecsSystem Spec
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24 Mar 2010   #102
mpcrsc562

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Product FRED View Post
I did not make a mistake. As I stated, both means will cool a system.
If I may,

In one of your earlier posts, you stated that a cpu fan that blows on the heatsink is blowing the hot air back to the cpu. The air is being blown across the fins of the heatsink, but directed away from the cpu--the air is not blown back and then stays put.

The reason why cpu heatsinks have fins is because the fins increase the surface area of the heatsink. Blowing air across the fins help to disappate the heat more quickly--which is actually more efficient. In the setup you mention, the fan sucking air away, not all of the heated air is going to make its way thru to the fan--some of it will rise, as heat rises.

In what you've stated, you might have a point if the the heatsink was ducted in some manner so that any and all air around the heatsink would be forced to go thru the fan, but in ordinary setups, blowing across the fins is actually more efficient. It gets rid of the most heat more quickly, which to me equals efficiency.
My System SpecsSystem Spec
24 Mar 2010   #103
mpcrsc562

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by rmw020 View Post
I have noticed a small difference with the cpu fan set as exhaust, it seems to be more cooler in idle state, i shall try it like this for a few days and see if i have any more difference guys.
Please don't take me wrong by thinking that I don't believe you, but to get a true test you have to put it under a load--for a while.
My System SpecsSystem Spec
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24 Mar 2010   #104
YTBOY83

Windows 7 64Bit Ultimate Edition SP1
 
 

Thats what i am planning on doing. Both ways.
My System SpecsSystem Spec
24 Mar 2010   #105
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by mpcrsc562 View Post
Please don't take me wrong by thinking that I don't believe you, but to get a true test you have to put it under a load--for a while.
That and there is no way possible that reversing the direction of the CPU fan is going to have any affect on the rest of the components. just the hard drive temps alone are enough to see that; 30C in the first, and 20C in the second (same goes for the video card). Either that or the first screen shot was after the system had been running for a while and the second was taken just after getting into Windows with nothing have a chance to get up to operating temperature.
My System SpecsSystem Spec
24 Mar 2010   #106
Dwarf

Windows 8.1 Pro RTM x64
 
 

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.
My System SpecsSystem Spec
24 Mar 2010   #107
Product FRED

Windows 7 Enterprise 64-bit
 
 

Quote   Quote: Originally Posted by rmw020 View Post
I have noticed a small difference with the cpu fan set as exhaust, it seems to be more cooler in idle state, i shall try it like this for a few days and see if i have any more difference guys.
A) I told you so.

B) Im not at war with you guys. We all seem to agree it depends on the setup. The OP can continue testing on his own and see what works for him.
My System SpecsSystem Spec
24 Mar 2010   #108
YTBOY83

Windows 7 64Bit Ultimate Edition SP1
 
 

Most ppl are right, cpu fan set as intake is the best way. I have noticed that both of my cores are even staying mid 20's for a few sec but mostly early 30's, when set as intake and as exhaust only one core stays in late 20,s and the other early 30's but mostly both in mid 30's.


Attached Thumbnails
CPU-exhuast.png   CPU-intake.png  
My System SpecsSystem Spec
24 Mar 2010   #109
YTBOY83

Windows 7 64Bit Ultimate Edition SP1
 
 

I can agree with product Fred as wll. it depends on the set up, most ppl go with a universal system which ppl take as he gospel truth.

Intake works best for me but maybe exhaust would work better for someone else.

End off.
My System SpecsSystem Spec
24 Mar 2010   #110
mpcrsc562

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Product FRED View Post
A) I told you so.
But it is obvious that there wasn't thorough testing done. Most people into the geekery of pc's know that idle temps don't mean jack. And as Stormy13 stated, there's no way reversing the cpu fan will have that big of a change with the other components.

Quote   Quote: Originally Posted by Product FRED View Post
B) Im not at war with you guys. We all seem to agree it depends on the setup. The OP can continue testing on his own and see what works for him.
I can only speak for myself--but I would think that the others would say the same--I'm not at war with you or anyone else--concerning this or any other subject.
My System SpecsSystem Spec
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