Fan CFM vs Pressure

[mazty]

I'm making a mini-itx build using the bitfenix phenom case without the need for the HDD racks, allowing a front intake of 2x120mm, and exhaust of 140mm and two top 120mm fans but that space will be occupied with a corsair H105.

My question is does the static pressure of the exhaust fan matter? I'll have the H105 most likely as an intake as that'll help it achieve optimal cooling performance, and the GPU will have the vented side panel and therefore all the clean air it can get. I was thinking that to help create an optimal air flow through the case, from front to back, and top to back, a high CFM & pressure exhaust fan (Noctua NF-A14 FLX) could help this. I know that pressure is usually regarded as helping when there is an obstruction, but surely it should also aid in creating negative pressure within the case if used as an exhaust? The front intakes will be 2x Silent Wings 2 due to their overall performance and db volume.

 

[manofchalk]

It matters when the fan is stuck up against a radiator or obstructive drive bay. When it comes to open air-flow environments (a typical top or back case fan) then only CFM matters.
There is some argument that you should use high pressure fans in open air enviroments to force air to where you want it to go, such as front intake to GPU, as opposed to just diffusing into the case like a CFM optimized fan would. But by that point its just splitting hairs IMO, it matters little.