How many fans should I install on my system?

Mican25

Commendable
Dec 16, 2016
5
0
1,510
Hello everyone, after lurking these forums for a while I managed to build my first PC, thanks to you. Everything was nice and dandy, until I installed the Sapphire RX 480, I thought I turned on the lawnmower. I managed to undervolt it to 980 mv from 1175mv and downclock to 1265 stable, performance dropped about 2% and GPU fan speed was then running at about 50% speed, so still very loud for my taste.

I eventually found out about the importance of airflow in a pc case, so as you can see in the pictures i have an intake in the front, and I used the CPU cooler's as an exhaust fan as an expermient. The CPU temps are great right now, I'm getting 45 degrees in games, and the GPU fan speed is running at 20-30% depending on game with a temperature target of 75 Celsius.

I wanted to work on the esthetics a little bit so I ordered 2 more 4 pin vents vents and I plan them to replace the current ones. The one in the front uses a 3 pin connector and my motherboard doesn't allow DC voltage control so it's always running at max speed. I can hear a slight humming sound coming from it, but I could leave it at the bottom as a front intake if the temperatures would improve.

So here is my question, should I go for 1 intake/ 1 exhaust, 2 intakes/1 exhaust or buy one more fan and install it at the top of the case and use that as an exhaust as well? Thanks a lot.

Also I have one more question. The front of my case is completely covered, so it's hard for the intake fans to take air from the outside, if not impossible. Should I get a new case? Thanks.

http://i.imgur.com/TndkZjb.jpg
http://i.imgur.com/mzxN1wM.jpg
http://i.imgur.com/lw1u50A.jpg
http://i.imgur.com/bXObJ1e.jpg
http://i.imgur.com/Wj7uChl.jpg

Sorry, can't figure out how to embed pictures.
 
Solution
At the very least I would move the existing intake fan to the lower mounting position so it would blow incoming air over the graphics card.

Or keep the existing fan and add another intake fan at the lower mounting position - see rule 3. As the article stated the negative pressure isn't as important on cases with the mesh panels which your case has. If you still want to keep the negative pressure you could also add an exhaust fan at the top of the case.

I would try these changes before buying another case. Your solid front cover isn't the best but it will draw air from the bottom.

Mican25

Commendable
Dec 16, 2016
5
0
1,510
Thanks for the great article. So I guess I should actually go for 1 intake, 2 exhaust fans to create that negative pressure. The question about my PC case still stands, is it ok if to mount the an intake fan in the front, even though the front is covered?
 

Neur0nauT

Admirable


Unless you have ventilation/holes on the front this would have no effect. There needs to be a steady intake of airflow directly to the fan. If you mount fans on the front grill with the cover over the top, then all it will do is draw a vacuum of dust wherever it can get in. Side mounting the fan might be an option.

Having a front intake would keep the airflow parallel, but it would not make a lot of difference to the negative pressure. As long as your intake is toward the front of the case - be it on the side, bottom or top would be sufficient along with your exhaust fans facing outwards at the back of the system.
 
At the very least I would move the existing intake fan to the lower mounting position so it would blow incoming air over the graphics card.

Or keep the existing fan and add another intake fan at the lower mounting position - see rule 3. As the article stated the negative pressure isn't as important on cases with the mesh panels which your case has. If you still want to keep the negative pressure you could also add an exhaust fan at the top of the case.

I would try these changes before buying another case. Your solid front cover isn't the best but it will draw air from the bottom.
 
Solution