How Do You Know Which Way Your Cpu Fan Blows

TunaSoda

I have read quite a bit most this and it seems that in that location are a lot of dissimilar opinions on this

What do yous recommend?

The CPU fan bravado towards or abroad from the heatsink?

hergieburbur · Dec 19, 2005 ane,907 0 19,780 0

The CPU fan should accident away from the heatsink to pull off backlog heat. This likewise helps draw air across the cooling fins. If yous have a rear fan (Like my 120mm exhaust fan), then the estrus that the cooler is blowing away gets exhausted from the instance.

94blue302gt · May 26, 2005 155 0 xviii,680 0

ditto, draw it away, and make certain you go a nice feed of clean air in in that location.
You want the coldest air closest to the cpu, and so if it draws information technology bottom upwards, it'll work amend than summit down.

Clob · Sep 7, 2003 1,317 0 xix,280 0

Have it blow into the sink to move air beyond all of the other components around the CPU (voltage regulators and such) that get a bit hot. All-time manner to find out for your current setup it to detect its max overclock i way and the the other... At least thats how I do information technology.

RichPLS · Aug 24, 2004 xv,886 0 50,780 0

Aree, information technology should blow down to the processor letting sucking the case air downwardly and over CPU circulating cooling chipset and mem also.
My LianLi PC60plus has an intake at rear, with a duct pulling in absurd outside air and blowing information technology towards meridian of CPU fan, then it can so pull cool air down to the CPU.
So down it is.

hergieburbur

Thats interesting. Thats the reverse of the mode it is commonly done. However, either will work, depending on your setup. on my rig, I have seperate VRM cooling, and the best thing I can practice is pull the air away from the Flake to the rear frazzle fan.

(I believe about instance circulate air in through the front and out the back. in that instance you desire to pull away, so you lot are not pulling hot air across the CPU).

The nearly important affair to remember is to movement air from the coolest source you can get to the nearset exhaust y'all can get. On different boards/cases, you will get different results, though I still generally recommend pulling air away.

rodney_ws · Dec 29, 2005 3,819 0 22,810 17

I've seen benchmarks where in some cases it was better to accept the fan suck air upwardly from the CPU and others where it was better to accident down on the CPU... given the broad diversity of results and the impact of case/heatsink designs, I'd attempt to measure out the thermal characteristics with the fan mounted each way in some sort of controlled environment. That's what I did and I believe I saved an actress degree or two.

In this example I'grand non sure there is a right answer, simply I could be incorrect.

hergieburbur · Dec 19, 2005 ane,907 0 19,780 0

one thing to notation, every bit rodney_ws stated, it that you are probably only going to save a degree or 2 by switching direction, which in most cases won't matter. It may play a petty into OCing, depending in the rest of your setup.

mpjesse · December 31, 2007 seven,214 0 25,810 half dozen

Wooooooooahhhhh. Guys. Stop. Practise some research. The merely time a CPU fan should blow air Away from a CPU is if you have another fan bravado air IN to the CPU (i.east., dual fan setup or a large case fan on the other side blowing air to it).

Air should ALWAYS be blown on to the heatsink in 99% of setups.

And the opposite way is never the standard setup. Every HSF solution on the market blows air on the heatsink.

Enthusiasts and what not are the ones who contrary it. I besides have seen comparisons on both setups, from what I've <seen>, in a instance w/ good air circulation, blowing air on the heatsink e'er resulted in the best solution.

-mpjesse

Vascular

LOL some people scissure me up. Your stock CPU fan will not piece of work well you opposite the rotation. PLEASE notice the fan blades are CURVED NOT Flat. This increases air book so that lower rotation speed can exist used. If you opposite management alone you are hurting performance of the fan. CPU coolers ever blow beyond the the rut sink to maximize coverage surface area. If you suck air abroad from the heat sink you lot lose a lot of area for reason that air always accept the to the lowest degree line of resistance and will but pull through the outer about fins thus overheating issues.

RichPLS · Aug 24, 2004 xv,886 0 l,780 0

PC-60plus also has a 120mm fan bravado out rear, forth with 80mm fan bravado duct to CPU for cool air.
Damn good cooling with LianLi PC-60plus example.

TunaSoda · Dec 2, 2005 663 0 18,990 1

Well, the 120mm CPU fan is now setup blowing thru the SI-120'south HS, and it works like a charm

The air from under the fins gets vented out of the case by two 120mm fans, pinnacle and rear (p-180)

Crashman · Dec 31, 2007 48,593 88 66,040 74

Well, it'southward obvious that the first two guys to bound in know nothing about what they're talking most. Of grade I have experience and training, yeh, I went to school for this stuff. Lamentable!

OK, and then the first problem with fans is that they pull air from the sides. That means a fan pulling air through the libation works less finer than a fan blowing in. Many of the guys here would say that a pulling fan has a larger "dead spot" in the center.

The second trouble relates to the first, since the fan pulls air from the side the only function of the cooler getting practiced airflow in the "pull" configuration is the top. Not the lesser, where the CPU is. Bad idea.

Information technology'due south such an incredibly bad idea that Intel, that'southward the visitor with all the funky engineers, specifies their ain designs, all of which blow into a libation rather than sucking out of it.

Now in that location was this cooler maker nobody remembers, I recollect they're nevertheless effectually, called Alpha. They idea pulling was amend, but realized that fans pulled air from the sides. And so they installed a shroud around the top half of the heatsink, so that air had to be pulled from the bottom. A funny affair happened: Even though the sinks were well designed and had a lot of surface surface area which optimized cooling, farther optimization was found by REVIEW SITES who reversed the fan, to blow inward.

This fan shroud is really obvious to dumb mechanics, as many hot rods have been constitute to overheat when y'all remove the fan shroud. All the same as previously stated, you become better results from pushing air.

One reason it's improve to push air of course is the directional thing previously mentioned. But another reason is...air doesn't pull very well. It'due south a gas. It likes to expand. Pulling just lowers the air pressure level.

And then it'south easier to attain the base of the cooler from a button configuration non merely because it'due south directional, merely because the force per unit area likewise helps information technology attain the bottom of the cooler.

All this has been discuseed numerous times of course. And there'due south other reasons why push works ameliorate, such as the air being cooler as you move abroad from the board. But when it comes down to it, you could simply search the forums and observe this all explained in more detail in old posts.

And and then you'd also find guys who were really good at arguing for the pull configuration...loosing. These modern geeks are too soft for that kind of debate.

hergieburbur · December 19, 2005 ane,907 0 19,780 0

Really, I went to schoolhouse for this stuff too (though I acknowledge I focused more than on IC pattern than high level system design), and I have received similar results from both directions in my setup.

After reading upwardly on the subject field, I volition admit that I was initially wrong and that in most cases the air should be pushed, though as I said, I think that it depends a lot on your setup. (I have a 120 blowing across near, and some other exhausting, and then I don't retrieve my CPU cooler does a whole hell of a lot of the cooling).

Crashman · Dec 31, 2007 48,593 88 66,040 74

Of course you're right near configurations changing results, but I've always seen a measurable difference no matter how slight.

hergieburbur · Dec 19, 2005 i,907 0 nineteen,780 0

I am certain you lot are correct, like I said, I don't call up my CPU fan actually does very much.

SciPunk · Dec 15, 2005 271 0 18,780 0

This is very interesting. I always assumed the fan was pulling air away from the heat sink, toward the frazzle fan toward the top and back of the reckoner case... and new cooler air would seep in through the sides of the heat sink. I was e'er nether the impression that the full general goal was to keep the air catamenia in the figurer case streamlined, like in those fume chambers used to test airplane wings. Thus the heat from the CPU would be caried out of the case in a smooth efficient electric current of air.

Blowing the fan in toward the CPU seems like pointing a fan toward a wall. Information technology volition bounce the warmed air in all directions causing turbulence in the organization, non necessarily toward the top/back of the instance.

I'm not saying this is wrong (or right), I'yard proverb it is counter-intuitive... at least from my mindset.

Crashman · Dec 31, 2007 48,593 88 66,040 74

Really, turbulance near the base is a GOOD matter, it stirs the air at the base and causes it to exist expelled when it mixes with some other part of the stream.

Unfortunately that'southward not exactly how aerodynamics works. Really in that location's a irksome-stirring bubble at the center of the base, that the surrounding air rides over. Just there's still some mixing event that way.

And so you lot compare that to the air being pulled through the sides of the height edge ot the cooler, and pushing looks good once more.

olip74

Howdy,

Coming to this mail a little tardily but take been looking into this myself and want to chuck in my tuppence-worth for anyone who comes later on. My first post here as well! I finally decided to register as I need to ask for assist with some other stuff only that'south another story.

I accept an old ATX case. the only fans are the PSU, GFX Card and CPU fans. My processor is an Athlon Thunderbird (1.1 GHz) with a basic aluminium (?) heatsink. The heatsink used to have a generic crappy fan, which blew outward, until I replaced it a while dorsum with a placidity Acoustifan job to reduce noise levels. Without thinking I put it on the same fashion, i.e. blowing away from the CPU.

I'm a little more than versed in PCs these days and wanted to try a bit of OC'ing, so I upped the FSB in stages and and then ran CPU Stability test until it crashed. The virtually I institute I could get was 109MHz without errors - pretty depression OC really! Anyway I ran MBM5 whilst testing the chip using the CPU Warming exam and noticed it was upwards at 58C - pretty hot but seemed stable enough. Then I had a bright idea and turned the PCU fan effectually. I ran the test once again and MBM5 showed 54C - a 4C deviation!

I belive the fact that I have not been able to raise the FSB speed any further is due to hardware limitations rather than the CPU temp (mobo is the main suspect - has bad caps, chipset seems to accept IDE trouble likewise) but this experiment certainly shows that, for low finish computers at least, a simple alter like this can have a big outcome. At the very to the lowest degree this should extend the life of the chip a niggling so worthwhile doing!

Groveling_Wyrm · Dec 11, 2002 1,842 66 20,290 155

Olip74...do you realize this thread was started almost ii years ago?

wildmon · Aug 20, 2009 1 0 18,510 0

I have a computer that sucks air in,and no i has mentioned the amount of dust this creates in the case opening and inside the case,needs to be cleaned out every three months or so.you lot could say i need to proceed my room cleaner tho lol

Regards Rob

epheterson

Intel put the sticker with the fan sucking air from the processor, and and so that'due south how I have mine setup.

niceget

Aree, information technology should blow down to the processor letting sucking the case air down and over CPU circulating cooling chipset and mem too.
My LianLi PC60plus has an intake at rear, with a duct pulling in cool outside air and bravado it towards acme of CPU fan, so it can then pull cool air down to the CPU.
So down it is.

The Processor Fan exist it a unmarried, dual or quad core should always "pull" the air away from the heat sinks. The idea of blowing air back onto the heat sinks is non logical. The rut only gets dispersed over the mobo and other components----in need to drawn away from the mobo.

The case fan should e'er be an Exhaust fan, pulling the hot air out of the instance. If you have ii exahuast fans, then the lower one should push air into the case and upper one pull information technology out.

I have a mini-belfry of which 1/3 of the example cover is a vent. I put in a loftier-speed transmission fan with low, medium and high fan speeds. In my scenario the dual processor fan pulls the heat abroad from the heatsink and the case fan (on constant medium speed) pulls the hot air out of the case which pulls cool air into the example from the large mesh screen near the bottom of the removable side panel. A manually controlled case fan is so much superior over a fan controlled by sensors, and you can go them for about 10 to twenty dollars. In my instance, my 9800 GT one GB video bill of fare, 500 Watt Power Suppy and dual cadre AMD 64 x2 5200+ processors are all staying cooler due to the air menstruation and mostly due ot the medium setting on my manually controlled case cooling fan. My processors driblet viii degrees celsius and my GPU 10 degrees celsius with a manually controlled three speed case fan.

How Do You Know Which Way Your Cpu Fan Blows

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