Hi guys. I have a Corsair 450D case. This case as standard has 2 fans at the front which suck air into the case, and a rear exhaust fan that pushes air OUT of the case. I have recently installed a Corsair H100i V2 liquid cooler. I have mounted the radiator and 2 fans to the top of this case where the air is forced OUT thru the top of the case. I have recently overclocked my CPU and I have been told to turn my rear exhaust fan around so that it therefore now sucks air IN. I have been told to do this to get more cooling to the CPU. Is this a good idea? Any comments?
Fan direction confusion
- Thread starter LHM
- Start date
Welcome to the wonderful world of "Everyone knows best" 
Personally (Your mileage may vary) Im on the theory that air comes in the front/bottom of the case and goes out the back/top.
This keeps it stimple, works with passive airflow (Thou that is basically bugger all) and means hot air is not being reimported into the case.
If you isolate a radiator and look at JUST the radiator, cool air flowing through it will mean a lower temp of coolant BUT if mounted to a case it means that warmed up air is then flowing through the case, warming up all your mainboard/VRMS/ Memory etc. Which I am not a fan of as it can cause hot spots in your case.
Other people say its all about coolant temp so everything else doesn't matter.
Do tests, and see what you personally find out for yourself is all i would suggest
Personally (Your mileage may vary) Im on the theory that air comes in the front/bottom of the case and goes out the back/top.
This keeps it stimple, works with passive airflow (Thou that is basically bugger all) and means hot air is not being reimported into the case.
If you isolate a radiator and look at JUST the radiator, cool air flowing through it will mean a lower temp of coolant BUT if mounted to a case it means that warmed up air is then flowing through the case, warming up all your mainboard/VRMS/ Memory etc. Which I am not a fan of as it can cause hot spots in your case.
Other people say its all about coolant temp so everything else doesn't matter.
Do tests, and see what you personally find out for yourself is all i would suggest
Yeah like VKleita says you ideally want your case to be as much like a wind tunnel as possible - cool air in, hot air out. If you turn your exhaust into an intake where is the heat from your graphics card going to go (i imagine a lot may end up going through your upper rad - not ideal)? Also if you do change you rear fan around you'll want to put a filter on it otherwise you'll accumulate more dust inside your case than you should.