3 x 120mm or 2 x 140mm fans case?

Solution
man it depends on the speed and the blades.
x3 120 at 2500 rpm performs better than x2 140 2000 rpm bc its just 20mm
there are some 3000 rpm 120 fans that can out perform a 2500 fan
also it depends on the radiation area so 3 can take place more than 2.
dont forget to put intake fans also.

i waant to buy the corsari 780t but say that i can use 3x120mm or 2x140mm and idk which is better for airflow, i think 3x120mm right?
 
man it depends on the speed and the blades.
x3 120 at 2500 rpm performs better than x2 140 2000 rpm bc its just 20mm
there are some 3000 rpm 120 fans that can out perform a 2500 fan
also it depends on the radiation area so 3 can take place more than 2.
dont forget to put intake fans also.
 
Solution


i mean considerating the same rpm is better 3 ?
 


Still depends on the exact fans .
I would just keep the 2x 140mm fans that come with it.
 

the same fans with different large xd
 

idk what u mean with " the cfm from input with match the one from the output for a same scale air flow" srry
 


List the fans.
I would just keep the 2x 140mm fans that comes with it.
Different fans are going to have different CFM even if they are running the same speed.
 


Fan Mount Locations:
Front: 3 x 120mm or 2 x 140mm
Top: 3 x120mm or 2 x 140mm
Bottom: 2 x 120mm (HDD Cage Removed)
Rear: 1 x 120/140mm
 

how to know the exact cfm do the vent ?