Would it make a diffrence if i put 2 Cooling fan together...

[Witch-Talon]

Like mounting 1 Cooling fan above another cooling fan would it suck/blow more cubic feet per min and would it make a diffrence in temprature if mount on CPU heatsink?

I was thinking of puting dual fan on my CPU heatsink my Athlon XP 1900+ It's pretty hot even with Artic silver III and Thermal Volocanco 7 I wanna make it colder...

If your gonna suggest me to use water cooling I aint gonna do that.

[SPEEDO]

I myself don't think it would work efficiently as the rpm's won't be exactly the same and they would end up fighting each other...

SPEEDO

[SLX]

Most fans are made to spin one way. So 2 fans spinning the same direction to blow air out together would cancel each others work out. If you find a fan that blows air out that spins counter clockwise and one that spins clockwise it might work. Kind of like a jet engines stationary and moving turbines. But it still might not work out or it might.

have you ever thought about buying a fan adaptor like 80mm to 120mm. I think that would be an effective cooling solution.

[Midknyte]

I'm not sure that stacking 2 fans would work.

If you put the 2 fans on the side and had one pulling air in and the other one pulling air out, it might work. it would maintain the air velocity over the heatsink. just a theory.

[rangeral]

There are some heatsinks that come as huge modules with 2 fans side by side plus even wilder combinations of 4 or 5 a couple of years back, don't know if there still around. Try a search at google.com. You can try it and let us know how you make out if you can't find long enough bolts maybe glue them together.

[AllGamer]

Originally posted by Witch-Talon
Like mounting 1 Cooling fan above another cooling fan would it suck/blow more cubic feet per min and would it make a diffrence in temprature if mount on CPU heatsink?

I was thinking of puting dual fan on my CPU heatsink my Athlon XP 1900+ It's pretty hot even with Artic silver III and Thermal Volocanco 7 I wanna make it colder...

If your gonna suggest me to use water cooling I aint gonna do that.

the first one about 1 on top of another one, it will actually KILL your air flow completely, as it will Nullify it.

But if you do it Side by side

as in 1 at the top
1 at each other side of the heat sinc

and all the 2 or 4 at the sides SUCKING AIR out, and the 1 at the top pushing AIR IN, THEN Yeah that makes heck a lot of a difference.

by say at most 5 C

[$1500-P4 gamer]

Why do you all think two fans blowing in the same direction rotating in the same direction would cancel each other out? It wont- what it will do is if they are the same fans it will reduce the air resistance that slows the rpms down in the real world. The cfm rating of fans is in no resistance setting-in the real world it doesnt ever work that way and you never get that speed. By useing two you get closer to the theorietical performance. This also works cause a fan sucks as much air as it draws in cfm's it just has more force on the output side. Easier to relate to would be thinking of air like water flow (just like in electronics-electron flow like water flow). If you had two well pmps both hooked into the same line they wouldnt cancel each other out. Nor would two streams of air one pumping into the next. My god havent you all seen blower boosters for heating. We have two- they have air flowing in from main fan at heater then they Boost it by useing other fans further down the duct. If what your all saying is true this would be self defeasting but it isnt. The distance between the two fans is irelevant-just as long as rotation and fan rpms are = (aswell as size). Hook two fans together right now and you will see what I mean. They dont grind to a hault. I also have seen dual fan modules in the past-they do work, they dont just stop spinning.

[SLX]

Originally posted by $1500-P4 gamer
Why do you all think two fans blowing in the same direction rotating in the same direction would cancel each other out? It wont- what it will do is if they are the same fans it will reduce the air resistance................................

Your right, the words cancel each other out, is wrong, they would not do that. I ment you would not get 2x the performance.

[jmichna]

To elaborate on $1500-P4 gamer's response...
Although you wouldn't get twice the performance, you would get some performance increase. At the least, you would increase the static pressure produced by the fans... hence the combination would have more "push" against any air resistance-causing obstructions like filter media or grills/vent openings.
jmichna

[AllGamer]

Originally posted by $1500-P4 gamer
Why do you all think two fans blowing in the same direction rotating in the same direction would cancel each other out? It wont- what it will do is if they are the same fans it will reduce the air resistance that slows the rpms down in the real world. The cfm rating of fans is in no resistance setting-in the real world it doesnt ever work that way and you never get that speed. By useing two you get closer to the theorietical performance. This also works cause a fan sucks as much air as it draws in cfm's it just has more force on the output side. Easier to relate to would be thinking of air like water flow (just like in electronics-electron flow like water flow). If you had two well pmps both hooked into the same line they wouldnt cancel each other out. Nor would two streams of air one pumping into the next. My god havent you all seen blower boosters for heating. We have two- they have air flowing in from main fan at heater then they Boost it by useing other fans further down the duct. If what your all saying is true this would be self defeasting but it isnt. The distance between the two fans is irelevant-just as long as rotation and fan rpms are = (aswell as size). Hook two fans together right now and you will see what I mean. They dont grind to a hault. I also have seen dual fan modules in the past-they do work, they dont just stop spinning.

reason i said that cuz i've actually tried it

It doesn't really NULLs it out.

but it just gets worse than Planned

the resason behind is due the RPMs

even if both were from the 5000 types or say even 7000 types.

each Dynamo, Rotor, motor, whatever you want to call it

Starts up and slows down at a different rate, including the air fliction and all, plus many many other physic equations.

to make it simple, in the real world

the first fan sucks air in,
then because they are stacked right on top of each other, they are so close that it actually BREAKS the air flow, for the next fan.

(Now this will work if say you leave at least a 2 inch separation between the 2 fans, 1 inch is still too close.)

so even if the 2nd fan, the one closest to the heat sink sucks air in, it's basically doing the whole job all over again, and harder, since now it doesn't get that cyclone effect as when it's alone., because the upper fan is in the way.

(and i repeat this is only when 2 fans are stacked together, as he asked)

have you ever study the air flow in NASCAR racing cars?, and why when they want to pass a car in front the stick it waaaaay up to their real

to exactely do the same effect break the air flow, so the car in front will slow down, and so the car behind can take over.

now the relation is Similar but not the same

with the 2 fans so close, the outgoing air from the 1st fan hits the pallets and walls of the 2nd fan before it can push it out in time, and since it has not enough room for it to compress, so it just Breaks apart. that Cyclon effect or sucking effect we are trying to archive here.

BUT, a trick that might work is to
have a 7000 rpm fan by the heat sink, and a 5000 rpm fan on top

now that should (againg theoretically) work, because the 2nd fan is "hungry" for air, and the 1st fan can suck it in just fast enough so it wont brock the airflow.

nOW the only problem if any is, IF the 2nd fan is drawing so much air pressure in, that in the long run might kill the 1st fan, cuz it's sucking faster than it can provide.

either way, i still like my other idea better

big heat sink 1 outward fan on each (left right top and bottom) side, and 1 inward at the center.

so that makes a big time sucking power.

if you cannot find a good heat sink with 4 open sides, but just the usual 2 open sides, then

left right, then center top.

left right out, and center in (default)

[Witch-Talon]

Wow thanks for the tremous reponses Alot of u guys made sense Problem is My ECSk7s5a MOBO got small space for cpu heatsink As shown here Theres isnt alot space to modify the heatsink on the sides And I do not wish to upgrade the mobo i do not need more spare parts that would never be used again...

[AllGamer]

Originally posted by Witch-Talon
Wow thanks for the tremous reponses Alot of u guys made sense Problem is My ECSk7s5a MOBO got small space for cpu heatsink As shown here Theres isnt alot space to modify the heatsink on the sides And I do not wish to upgrade the mobo i do not need more spare parts that would never be used again...

i know what you mean
my original idea was the same stacking 2 fans on top of each other because of the DARN SMALL SPACE, but that doesn't work

BUT if you catch what i just though above.

The same plan, but with 2 fans of different speed might work for you.

a 7000 rpm fan, + a 5000 rpm fan on top

7000 are the newer ones. they usually go for around $15+ depending on the brand.

if you feel like trying that should do the trick.

as for the other setup with Fans on the sides.

i used Smaller fans for the sides
the types an Old Pentium or 486 cpus will use.

those fits "almost" perfectly