Solved CPU

[YTBOY83]

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.

 

[mpcrsc562]

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.

 

[mpcrsc562]

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.

 

[YTBOY83]

Thats what i am planning on doing. Both ways.

 

[stormy13]

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; 30°C in the first, and 20°C 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.

 

[Dwarf]

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.

 

[Product FRED]

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.

 

[YTBOY83]

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.

 

[YTBOY83]

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.

 

[mpcrsc562]

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.

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.

 

[smarteyeball]

Wow, what a thread. Talk about a heated debate...



How about leaving it at "One method does not fit all" and then let each use what method they have tested that suits their individual setups?

 

[YTBOY83]

I totally agree, it needs tested being idle, and also overclocked with more tests.

 

[mpcrsc562]

Wow, what a thread. Talk about a heated debate...



How about leaving it at "One method does not fit all" and then let each use what method they have tested that suits their individual setups?

Second that motion

 

[YTBOY83]

Good topic huh lol.

 

[Product FRED]

I will agree it definitely depends on the setup. When idling or working at low load (ie not overclocking or gaming) it would seem more efficient to have an exhaust. When using a lot of power it would definitely be better as an intake. I'll admit right off the bat that I learned a lot from you guys.

/thread. (seriously, please)

 

[CarlTR6]

It is a very good topic and I learned.

 

[YTBOY83]

Well Said

I will agree it definitely depends on the setup. When idling or working at low load (ie not overclocking or gaming) it would seem more efficient to have an exhaust. When using a lot of power it would definitely be better as an intake. I'm not going to be an ignorant jerk and I'll admit right off the bat that I learned a lot from you guys.

/thread. (seriously, please)

Thats good to hear that, i hope you enjoyed the big discussion brought by my topic.

 

[cloud8521]

so i did my own tests, i tried to keep everything as close the the same as possible, a thermometer keeping track of the room's temperature, and keeping my case open so other components heat levels would not affect it. unfortunately being the idiot i am i forgot to take any pictures to prove it so you have to go by my word.

with the fan inverted, i would always hit 3+ (min 35 degrees c) degrees higher during idle with a max of 46 degrees c, and during load i has to end the test rather quickly because i had the temperature go near the cpu's max rated temp (70 degrees c) and hardly fluctuated, it just steadily climbed in temperature.. i will not try that again.


as for blowing, i get a max temp of 58 degrees C where the temperature would fluctuate quite a bit (that means it was doing its job). and idle had minimum of 32 degrees c with a max of 35 c.


the physics do suggest that no matter what blowing should be more effective, my tests do prove it, but i really dont want to do this again, it was a pain, and my boss was not happy with how tired i was when i got to work after that night.

 

[CarlTR6]

Thanks for sharing your results.

 

[cloud8521]

Thanks for sharing your results.

no problem, sorry i could not get pictures, when im tired im sometimes crazy