H80i both fans needed?

[Shinkachi]

If I buy a H80i, does it have to have both fans mounted on each sie, one pulling, other pushing, for it to work correctly, or is 1 enough??

 

The reason I ask is that bigger radiators only have fans on one side (I know they have bigger area of cooling, but staying with the "More is better" saying, shouldn't they have on each side???)

[Guest]

One is plenty.

[TheMcSame]

Much like Dav said. You only need 1 on the H80 because the rad isn't thick and I believe it has a low FPI. You only need a push/pull setup for thick and dense radiators.

[Shinkachi]

Okay, becase it's kinda cramp in my pc case, and all the pics I've seen was with fans mounted on both sides of the radiator and then mounted inside the case. But if you say that 1 is enough, then I'll trust you  
But, is it best to draw air INTO the case, or OUT via the radiator? (Only place with space for H80i is rear)