The theory behind cooling "GameChanger" :
One crucial point of cooling using a HSF (heatsink-fan) cooling system ,is
to manage to direct the coolest part of air onto the hottest part of heatsink .
.....
That is actually one of few basic laws of an efficient HSF cooling system .
Blowing or sucking air ?
There's not a definite answer to that question ...
It depends of the system to be cooled ,which of those two airflow directions ,
should be preferred over the other .
In the design of "GameChanger" sucking air was preferred over blowing air onto the heatsink .
Each heatsink is quite flat with a 10mm thick base .
Thick base on a heatsink means high heat surface dispersion .
As heat 'travels' through base ,cause of thickness it 'disperses' more ,
when it reaches the back side of the heatsink (where the fins are ) ...
Fins are quite spaced apart ,being thick and short .
They 'suck' plenty of heat fast and have the ability to 'transfer' it fast ...
To convect it with air.
But they are not the kind of fins to convect better when air is blown to them.
They are actually "passive" efficient fins .
If air is blown to a back side of a heatsink ,at least two things are happening :
A ) The air comes 'in contact' with the fins first ,thus cooling them .
Kinda 'locally' ...So in this design i) heat generator / chip should be placed exactly beneath airflow.There's where's the highest convection .(cooling ).
As air reaches the bottom of the heatsink ,is rather hot with not much "heat capacitance" to efficiently convect heat as before ....(coming out from fan blades ) ....
So base of the heatsink is not effiently cooled as the fins .
But because fins are cooled first (more efficiently ) ,more heat goes to them from base of the heatsink ...
So in this design ii) Fins made specificly for blowing air to them are high and thin ,oftenly closely spaced between them ,like in car/fridge "radiators" ...
B ) Dust/debris gathers on front , where fan is blowing .
Another type of heatsink ...
Completely another type ...
So at each heatsink ,two CXA3070 are placed near the sides ( length-wise ) of the heatsink .
Hottest point is near the sides ...(length-wise...)
In order ,to keep as much possible,of the incoming (sucked ) cool air ,lo, near the thick base and
short /thick fins ,specially at both the sides of heatsink's length...
A 'restrainer' is used to 'constrain' airflow where is needed most and when is at it's coolest point .
So..A wide fan is used at each heatsink and a restrainer lid ,with the fan centered at back of each heatsink.
Sucking air .Cool air enters at both sides ,length-wise,and at it's coolest state ,convects with the hottest part of the heatsink.Where CXA's are placed.Constrained as is the airflow ,travels to the center of the heatsink (the least convecting part in this design ,as opposed to 'blowing' design ) ,where it exausts in the inner compartment of the case ...
If case did not had a top lid ,then two fans would have been enough ....
But this ,I'm afraid ain't a 'cabriolet' model ...
So another pair of fans is used to exaust the hot air of the inner case compartment...
Because ,it is' in series ' with the heatsink fan pair ,it increases the total ' negative pressure' ...
Sucking air becomes more 'easy' ,but actual airflow has not changed/remains same ...
Just the airflow's 'ability' to 'overcome' 'obstacles',as travels from inlets to exausts ,
is increased/augmented .
Dust will gather firstly(and mostly ) at the air inlets .(all possible ones ...)
This design has plenty of cooling "power " ..
Handling the heat from the 2A max drive from 4x CXA3070,is probably a piece of cake ...
But ..with a price ...
Noise ...
Quite a lot over the 6/12 speed set ...