Heat Sink Fan Direction

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AniAM

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I drew this diagram abruptly and only for understanding purpose-


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My Query is that in which direction I should put the HEAT SINK's Fan?

Number 1 - towards the RAM Sticks?
OR
Number 2 - Towards the REAR exhaust fan?

Asking this because of the RAM's heat absorption. If I throw too much of CPU heat on the RAM, those might get affected, right? It's not that kind of hectic thought but As I am installing Cooler Master Hyper 103, I got to put the heat sink carefully.
 
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Karadjgne
Yep. Exhaust<~heatsink<~fan<~ram. Unless you have highly overclocked the ram and are using it to maximum capacity over extended amounts if time, the chances of overheating the ram are pretty minute, to the point where even those fancy heatsinks are more for looks than actual function.
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photonboy

photonboy

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agreed.
You could point to the rear or top provided there is a case fan in either position, however pointing to the rear provides much better air flow across the RAM sticks.

*It's important to understand that often hot air is better than NO air movement. The air may be hot, but it is still allowing the heat from the RAM sticks to move away.
 
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AniAM

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The last paragraph is truly good. There's no movement of air if the fan pointing to the rear but in this case, would the top outtake fans help to exhaust the hot air? Coming to this, I used to have the stock cooler and there's no air movement around the RAM because the fan was fron facing as we know. Which one do you recommend finally? Lemme know.
 
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AniAM

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What about the top exhaust fans? Don't they help in this case?
 
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Karadjgne

Karadjgne

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Properties of thermal dynamics state that heat rises. And left alone it does. If it has help from top Mount exhaust fans, that's all the better. The problem with facing most tower coolers up 90° is that the fan infringes on the gpu. It's either very close to almost touching, which limits the airflow around the cpu cooler as well as making the cpu cooler almost directly responsible for removing the hot gpu exhaust since that exhaust will come right out the side of the gpu, right where the cpu fan is trying desperately to draw air. End result is case temps being lower, but cpu temps definitely being higher. So facing the tower towards the rear exhaust becomes optimal as the rear exhaust fan will draw a good percentage of the cpu cooler heat directly out. This only applies to towers like the hyper212 or twin towers like the Noctua D-14 which h have a directed airflow. Stock coolers have a broadcast airflow, as do stock imitators like the Noctua C-12p which end up blowing air in every direction. Stock imitators are very good at maintaining lower motherboard temps, so work best on an OC system lowering VRM's temps etc. They'll also provide a breeze around the ram. Being broadcast, they also benefit from top exhaust the most rather than rear exhaust since the heat will rise better than going 90° sideways. In this case, it's more about helping thermal properties and not so much forcing them.
 
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AniAM

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About it, the negative cooling does take the heat out of the RAM sticks. I used to abhor the concept of negative cooling and that is why got stuck with RAM facing. But as I saw that the RAM can take up to max 95C, so I had to make mind to believe that the rear facing fan will do the job. I always wanted to use FLIR sensor. But thrashing the CPU heat (and my room's ambient temp) on the RAM would be going up because of the top fans. The sink itself absorbs the cpu heat and the fan over heat will already make some air out I presume. So, what's the final say? RAM facing fan right?
 
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Karadjgne

Karadjgne

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Yep. Exhaust<~heatsink<~fan<~ram. Unless you have highly overclocked the ram and are using it to maximum capacity over extended amounts if time, the chances of overheating the ram are pretty minute, to the point where even those fancy heatsinks are more for looks than actual function.
 
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AniAM

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You probably gave one of the most important helps about the fan direction. That's an intake fan and there's no meaning to face it towards the rear fan right. Sadly, I faced a prob about the temp. Can you help me with this problem? http://www.tomshardware.co.uk/forum/newresponse/3182880
 
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