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Hyper 212+ Pull Only?

post #1 of 20
Thread Starter 
I was just wondering if anyone has tried using 1 fan with the Hyper 212+ and having it pull only. I only ask because then the fan wouldn't be in the way of my RAM slots.

I work in networking and most chassis switches (Cisco 6500) use the pull only method, so to me it seems like an effective way of cooling.

Thoughts?
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post #2 of 20
IMO I would believe temps would go higher, sense there is no cool air being blown into the heatsink, just hot air being taken out, so the hot air basicly just sticks around.
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post #3 of 20
I think you are looking for something like this thread

http://www.overclock.net/water-cooli...push-pull.html

Of course push+pull is going to be cooler, but look at that thread for the exact details

Just make sure you dust it regularly, I didnt dust mine for a month and it looked like a rabbit
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post #4 of 20
Thread Starter 
I might try it and see what happens.

Thinking about it, I would think pulling would be more efficient. The fan is sucking air in thru the heatsink and exhausting it out. With a push only method, you're throwing a lot of air into the heatsink, but you're really relying on your case fan to exhaust it.

I would think exhausting more hot air would be better then intaking more cool air. Just my 2 cents.
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post #5 of 20
just have the fan a little bit higher so it clears your ram, its perfectly fine that way
   
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post #6 of 20
Quote:
Originally Posted by branflakes View Post
I might try it and see what happens.

Thinking about it, I would think pulling would be more efficient. The fan is sucking air in thru the heatsink and exhausting it out. With a push only method, you're throwing a lot of air into the heatsink, but you're really relying on your case fan to exhaust it.

I would think exhausting more hot air would be better then intaking more cool air. Just my 2 cents.
Pushing is better. The foundation for that reasoning is that air is a bad conductor of heat.

Heat conduction is different than heat convection. When air is moving, it is transferring heat via convection.... if it is not moving, it is transferring heat via conduction. Since it sucks as a conductor it needs to be moving and moving quickly to accomplish anything significant.

The air velocity over the fins is higher in the push configuration, and this air will flow over a larger total fin surface area than in the pull configuration. In the pull configuration much of the air over the fins will be static/not moving and thus really doing absolutely nothing. If you do not continually cool the fins, they will heat up (when I said air is a bad conductor of heat, that is equivalent to saying it is a good insulator) and reduce the temperature differential between the CPU and the heatsink. Once the temperature difference between the cpu and the heatsink is very small or zero, very little to no heat will be removed from the CPU and the CPU will continue to generate extra heat (from the electrical power provided) until it just shuts off.

Of course thats why we have fans, but it just goes to show you that you NEED airflow over the fins. Your case exhausting air is secondary to good airflow over the heatsink, by far. Many say that the most important thing is the ambient temperature (room temperature) when in reality it is the temperature of the heatsink that matters the most. And you can keep that low with proper airflow in the push configuration, also with higher RPM obviously. Besides, you probably have plenty of intake/exhaust for you case anyway.

Also, the reliance on fluid velocity is not the case with water because water is A) significantly more dense & B) has a higher specific heat. This means it can absorb more heat per unit mass, and on top of that there is much more mass available in a water cooling loop. Thus we don't need it to be moving super fast over the surface of the heatsink, nor do we need a large volume of it (because of the density), but all of those things still help of course.
Edited by donkrx - 8/11/11 at 9:53pm
    
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post #7 of 20
well, the only reason he suggested pull was because the fans would be in the way of his RAM slots. This was the problem for me too

If you look closely at my first fan, it is slightly raised in order to clear my ram. This way you get your push/pull config and also pulls the hot air from your RAM, cooling it in the process

   
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post #8 of 20
using a pull fan shouldn't really make a difference in temps, the same air temp is coming through, maybe the static pressure wont be as good
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post #9 of 20
I recently built a budget computer for my room-mate, and got him the CM212+. Unfortunately, I had the same problem with RAM clearance (I should've really checked it out...)

I ended up making it a pull-only. The temps were still well within acceptable range.

I had to mangle the BladeMaster they included with it to work though...
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post #10 of 20
pull will maybe be 1-2C higher than push, but as shown above push/pull CAN be achieved due to reasons specified by OP
   
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