Motherboard rotation and GPU cooling

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Cameron Wilson

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May 22, 2014
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I am planning to build a new case from scratch using oak and aluminium. I've been drawn towards the idea of mounting the motherboard with the I/O at the top, as it means I can place the PC flush against the wall, and I think it makes cable management easier. Doing some research, I came across a thread (few years old) that said GPUs with non blower style coolers would perform poorly due to the orientation of the heat pipes. I'm looking to buy an AMD R9 series card, and I certainly don't want to have that noisy stock cooler. Does this problem still occur with more modern graphics cards? Would this really be an issue? Has anybody had any experience with this problem? Would the MSI twin frozr, Asus dcu, or gigabyte wind force cards be effected?

Thanks in advance.
 
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ksham

ksham

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Mar 29, 2013
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I own a GTX 780 and it's quiet. I definitely can't hear it over the fans in the case. I think the problem with the IO at the top is that it conflicts with the way that heat naturally rises. And there will be little good configuration for airflow in that state. Blowing across is fine but heatsink (if any) and the gpu can block a lot of air. Blowing top down is rather silly because it would fight against mother nature (that heat naturally rises), and when it hits the bottom of the case, there's no escape. Blowing from bottom up is okay as long as it is heavily dust filtered and there are holes at the top have holes for the heat to escape, but that's also where the IO will be. Having intake from the side is not bad, but again, you will want some holes at the top.

So in terms of design, it's a bit hard to pull off.
 
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Cameron Wilson

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May 22, 2014
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I'm not going to be pulling air in from the top. I will be having 3 120mm fans on the bottom (pulling air in), a 120mm fan on the top beside the I/O (exhausting), then a couple more blowing onto the GPU. Kind of like a Silverstone fortress or raven case.
 
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Cameron Wilson

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May 22, 2014
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Its not necessary, the higher pressure air inside the case will diffuse out naturally and passively. But there will be extra perforation to aid this process.

All of this is beyond the point really, I just want to know if -and why- certain graphics cards will perform poorly when mounted in a non-standard orientation.
 
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