I am building a new rig and the most practical place for my H80i radiator is the rear vent. Corsair recommends that fans pull air IN... so... that reverses the typical airflow of a system.
Now I'm wondering where to put my fans and how to orient them for optimum airflow. I have a Corsair PSU at the bottom of my Define R4 case but I'm unsure if it's venting or pulling air in. (I haven't powered on the system yet).
I also have two 140mm intake fans at the font which I'm thinking should be reversed to vent? Or should I get another 140mm for one of the two top vents?
I recommend you have it blow out of the case normally. 2x front fans in, h80 +2x roof fans out. The PSU should suck air in from the bottom of the case and exhaust it out the back, thus being insulated from the airflow of the rest of the case.
That is a big can of worms you'v just opened. Positive vs Negative case pressure is a well debated topic, and no clear winner has come out of it. It largely does come down to personal preference.
In a nuteshell it comes down to this.
- Less dust in the case
- Slightly better temps.
And even that's fairly subjective to what case your using, what cooling solution you have and the hardware you have. I personally have a Positive pressure system, just because I have to clean it less and the way my cooling is set up, I want a lot of airflow out the top vent through a triple radiator.