Case fan setup.
Case fan setup.
I have a query about fan configuration. The positive/negative pressure concept is unclear to me—does one help reduce dust while the other prevents it? I'm replacing two Corsair AF140L exhaust fans with two Noctua NF-P14S intake fans. I'm considering using the AF140's quiet non-led model with higher CFM (67.8) instead of the intake fans. The Noctua models max at 1200 RPM, so would higher RPM for the intake be beneficial?
RPM is only part of a fan's performance; what matters for comparison is CFM, where higher is better. However, it's not straightforward. It's preferable to maintain a slight positive pressure in the case, meaning total CFM should exceed total CFM out, which helps cool components more effectively. If positive pressure is introduced into a negative one (i.e., CFM out becomes greater than CFM in), the cooling performance will decline.
You need your intake to allow sufficient airflow into your pc for optimal cooling, ensuring higher RPM isn't necessary, but excessive RPM might draw in too much air, keeping heated air trapped until the exhaust can keep up.
I prefer a positive pressure setup for better effectiveness (just my view).
Do you only have the top exhaust fans, or do you also use a rear fan for exhaust?
You're looking for a balance in your intake design to ensure proper airflow for cooling without excessive RPM. You mentioned considering positive pressure as a better option. Also, you asked about exhaust setup and whether your rear fan is the only one or if you have additional components. You also noted using a Corsair H80i GT mounted rear exhaust.
JanHyka suggests checking this article on air pressure: http://www.silverstonetek.com/techtalk_c...h_positive