Intake vs Exhaust

[Wojo]

I have a Phanteks Evolv Shift XT and plan on using the Air Boost setup.  

MB is an Asus ROG Strix B650E-I

CPU is a R7 7700x being cooled by a Noctua NH-L12S.

My PSU is a Lian Li SP750. 

GPU is a Gigabyte RTX 3060 Gaming OC 12G rev 2.0 .

 

Here is my question.  With a case like this do I need intake fans?  The case can breath passively from all sides and the plan is to put two Noctua NF-A14 140mm PWM fans on the top exhausting.  

The PSU fan is intake and as of now pulling air from outside the case. 

 

I had an idea for flipping the PSU and having it work as an exhaust from inside the case and have the top fans act as intakes.  Issue with this is cable management as the spot behind the PSU is used to find all the cables.  Also is that extra heat going to strain that PSU?

 

Other idea I had was to have the front top mounted fan intake over the first 1/2 of the GPU and also over the MB and L12S while having the back one Exhaust.  I question how efficient this would be as the fan would be working against each other on both sides of the case and possibly just recycling the air.

 

Last option would be to have both set to intake fresh air and having it passively disperse out of the case.  The case is full metal but open everywhere other then the small front end.

 

Any thoughts would be helpful.  First time building in a ITX case.  

 

[Jurrunio]

Dont use the PSU as path for case airflow, leave it alone with the fan facing outside. They are temperature sensitive, a degree hotter is worse for it than CPU or GPU running a couple degrees hotter.

 

As for intake or exhaust, I would prefer exhaust just because blowing into a ton of obstruction (as would happen as an intake) is not as efficient to me.

[NorKris]

intake is proven to give better temps