why would one put fan on both sides of the radiator?

[abhong]

as the title says, i've noticed some folks putting 2 fans on either side of the radiator, why would one do this? does this enhance performance?

 

[Raider1284]

its called a push-pull setup and yes it defineately helps performance. One pushes air into the radiator and the other pulls it through. Usually people do it because you can run them at slow quiet speeds but they still peform very well, due to the push-pull arrangement.

 

[aigomorla]

Originally posted by: Raider1284
its called a push-pull setup and yes it defineately helps performance. One pushes air into the radiator and the other pulls it through. Usually people do it because you can run them at slow quiet speeds but they still peform very well, due to the push-pull arrangement.

+1

 

[nealh]

Originally posted by: Raider1284
its called a push-pull setup and yes it defineately helps performance. One pushes air into the radiator and the other pulls it through. Usually people do it because you can run them at slow quiet speeds but they still peform very well, due to the push-pull arrangement.

Hmm..can you show where it provides that much of a benefit..as I recall from reading at XS it helps a small amount, but I will admit I could easily be wrong

Now the noise issue is not something I considered..so it maybe a big benefit by undervolting your fans to 5v-7v and get same performance as single set of fans in in pull or push only config at 12v

IMHO..the biggest issue is the extra space needed for push-pull config...given 2 sets of fans and a radiator..need to make sure you have alot of space in your case if you internalize

 

[Raider1284]

i find this afer a little bit of searching
"PA160 with 1x Panaflo M1A@7v
Well... I'm impressed...

Air<: 24.0 | 23.5 | 23.0 | 23.5 | 23.5 | 23.0 | 24.0 | 23.5
Air>: 31.5 | 31.5 | 31.5 | 31.5 | 31.5 | 31.5 | 32.0 | 31.5
Liq<: 37.0 | 37.5 | 37.5 | 37.0 | 37.0 | 37.5 | 38.0 | 38.0
Liq>: 35.5 | 36.5 | 36.0 | 36.0 | 35.5 | 36.0 | 36.5 | 36.5
CPU: 21.0 | 22.0 | 21.0 | 21.0 | 21.0 | 21.0 | 21.0 | 21.0
GPU: 21.0 | 22.0 | 22.0 | 22.0 | 22.0 | 22.0 | 22.0 | 22.0

Avg Air <: 23.5
Avg Air >: 31.5
Avg Air Dt: 08.0
Avg Liq <: 37.4
Avg Liq >: 36.0
Avg Liq Dt: 01.4

Only 1 or 2 degrees hotter than the HE120.3 manages on CPU & GPU temps, with 2 less fans = less noise. Always a bonus!


PA160 with 2x Panaflo M1A@7v (PushPull with dual shrouds)

Air<: 23.0 | 23.0 | 24.0 | 23.0 | 23.0 | 23.5 | 24.0 | 23.5 | 24.0 | 23.5
Air>: 27.0 | 28.0 | 27.5 | 27.5 | 27.5 | 27.5 | 27.5 | 28.5 | 28.0 | 29.5
Liq<: 34.5 | 35.5 | 36.5 | 36.5 | 36.5 | 36.5 | 37.0 | 37.5 | 37.5 | 38.0
Liq>: 34.0 | 35.0 | 35.0 | 35.0 | 35.0 | 35.0 | 35.5 | 36.0 | 36.5 | 36.5
CPU: 19.0 | 20.0 | 21.0 | 20.0 | 21.0 | 21.0 | 21.0 | 21.5 | 21.5 | 21.5
GPU: 19.0 | 21.0 | 21.0 | 21.0 | 21.0 | 21.0 | 21.0 | 22.0 | 22.0 | 22.0

Compare these figures to figures above - result? 2x fans in Push-Pull is of no major benefit over 1x fan in push."

so no there isn't a huge performance difference, but there is a difference, noise should be the main reason to go for push pull

almost forgot posting the source: http://forums.bit-tech.net/showthread.php?t=100730