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Noob question on push-pull fan config

S

ShafTDawG

Gawd
Joined
Apr 2, 2008
Messages
830
Sorry for asking such a noob question, but in a push-pull config, do both fans face AWAY from the heatsink?

Also, would there be a detrimental effect if the two fans are not of the same speed/cfm? I want to use an NT-06 Lite I have lying around, and strapping a fan on it blowing downwards (putting the fan under the heatsink), and the PSU pulling air upwards (I have an SG-02 case, so the NT-06 would be sitting directly under the PSU fan)

Summarizing, the airflow on the heatsink is going to be the PSU fan pulling air upwards, and another fan pulling air downwards. Unless I have the whole idea of the push-pull fan config wrong, I think that this will work quite well.

I'm currently using a Scythe Shuriken with the fan on top pulling air upwards toward the PSU, and I'm seeing idle temps at around the mid to high 40s and load temps of mid 70s to low 80s with my current OC. I just want to improve heat dissipation as I'm scared that I'm heating up the CPU too much.

Looking forward to getting helpful advice.
 
push air in one side, pull it out the other, fans keep air going in the same direction, having to facing in or facing out is just going to fight each other
 
Oh ok, so I guess I was really confused about that. Thanks a lot.

So I would see an improvement on my temps with the bottom fan facing UPWARDS blowing air into the PSU?
 
You want the air all going in the same direction. Cooling of the fin surface is a function of the volume of air moving over the fin, the temp of that air and the temp of the fin. So you want as much cool air flowing over hot fins as possible. Push pull historically had meant both fans face/blow air in the same direction so they tend to help one another out and increase air volume. F -> HS -> F =>

I suggest you have the heatsink fan pointing toward the PSU so that the HS fan blows the warm air into the PSU which its fan will help get it out of the case and help create negative pressure in the case so cool air is encouraged to enter the side venting.

Bleh SSF case

Hmm SFF case, your temps are going to tend to be higher. You cannot compare it to our typical larger cases with a zillion fans/vents.

In case someone else would like to comment here is the case. (I think)
http://www.newegg.com/Product/ShowI...=SILVERSTONE SUGO SG02-BF Black Computer Case

here is the HS.
http://www.newegg.com/Product/Produ...0&Order=BESTMATCH&Description=NT-06&x=24&y=40


Interesting as that heatsink is designed for the fan to face downward so the components around the CPU area get "washed" in air. Its warm air but air movement over the components of the CPU voltage regulation circuity grouped around the socket is a great help in long reliable life. It is why the Intel stock heatsink is designed as it is. well - one reason.

So you have a problem. Due to the small size and design of that case it will be difficult to have an optimal setup.

Me, personally, I would have the heatsink fan blowing up into the bottom PSU fan and find some way to mount a fan like the one used in the hard drive bay where it would suck air in through the side vents and blow it over the CPU area to cool those components and also help provide cool air for the CPU HS fan.

But a few zip ties to temp hold the fan and some rainy day testing would be a good thing too. But think the key is going to be doing something to get cool air into the case, that hard drive fan is good for the HD's but is not doing much to get a significant amount of cool air into the case. Its all left to natural convection through the side vents and that is not good enough for a high performance system.

So no easy "do it this way answer to this one".
 
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