- Oct 26, 2012
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I was wondering what I should do with my case fans. Like what RPM should I have them at. And also if I should put another air intake fan at the bottom of my case.
This is my setup....
First of all, I have a Fractal Design Define R4 w/Window (Black) case. You can look up all my specs if you just hover over my name. I have a Corsair H100i setup at the front of the case, I was able to do this because I removed my HDD cages. So my H100i is receiving the coolest air from the outside of the case.
The two 120mm Corsair SP120L fans rotate at up to 2700RPM and push out up to 74.42CFM a piece. They are also acting as my lone 2 intake fans. I keep them spinning at around 1600RPM, which if you do the math, it leaves me with 44CFM per fan, or a total of 88CFM for both. Keep in mind that the radiator is right in front of the 2 fans, so the airflow is somewhat inhibited.
For exhaust I have have 1 rear NZXT 140mm blue LED fan, and on the top I have 2 NZXT 140mm blue LED fans. These fans supposedly make 83.6CFM@1000RPM+/-200RPM. Running at full speed these fans would expel 250.8CFM of air out of my case. But my fan controller can keep these fans at either 5v, 7v, or 12v. So we can figure that if the fans are set at 7v, the fans are spinning at around 600RPM+/-200RPM. And instead of 83.6CFM per fan, we'll get around 51CFM. If you combine all three we are exhausting or pushing out 153CFM of air. And this isn't even including the PSU, which also exhausts air.
Now if I would put my 3 exhaust fans at 5v instead of 7v with my fan controller they would be spinning at approximately 400RPM+/-200RPM and pushing out around 34CFM per fan. Now my total would be 102CFM.
I usually do keep my fans at 5v using my fan controller. Now we know that my PC is intaking 88CFM, and it is exhausting 102CFM. My PC case is exhausting 14 more CFM than my intake fans are pushing in(not counting the PSU). This means that inside my case there should be a suction, making the exhaust fans work a little harder.
QUESTION>>>>>>> I'm not an expert on fans and I don't know my science either. Should you have more intake or more exhaust? How does that work? Is my setup fine? Should I have more intake or more exhaust? Should I add an intake fan to the bottom of my case right in front of the PSU? Is it a problem that my H100i's two fans are my intake fans also?
I know this is a long thread, but I like for you to have the facts, and I really want someone knowledgeable to answer these questions for me. This build I have cost major cash, and I'd like to have it setup right.
This is my setup....
First of all, I have a Fractal Design Define R4 w/Window (Black) case. You can look up all my specs if you just hover over my name. I have a Corsair H100i setup at the front of the case, I was able to do this because I removed my HDD cages. So my H100i is receiving the coolest air from the outside of the case.
The two 120mm Corsair SP120L fans rotate at up to 2700RPM and push out up to 74.42CFM a piece. They are also acting as my lone 2 intake fans. I keep them spinning at around 1600RPM, which if you do the math, it leaves me with 44CFM per fan, or a total of 88CFM for both. Keep in mind that the radiator is right in front of the 2 fans, so the airflow is somewhat inhibited.
For exhaust I have have 1 rear NZXT 140mm blue LED fan, and on the top I have 2 NZXT 140mm blue LED fans. These fans supposedly make 83.6CFM@1000RPM+/-200RPM. Running at full speed these fans would expel 250.8CFM of air out of my case. But my fan controller can keep these fans at either 5v, 7v, or 12v. So we can figure that if the fans are set at 7v, the fans are spinning at around 600RPM+/-200RPM. And instead of 83.6CFM per fan, we'll get around 51CFM. If you combine all three we are exhausting or pushing out 153CFM of air. And this isn't even including the PSU, which also exhausts air.
Now if I would put my 3 exhaust fans at 5v instead of 7v with my fan controller they would be spinning at approximately 400RPM+/-200RPM and pushing out around 34CFM per fan. Now my total would be 102CFM.
I usually do keep my fans at 5v using my fan controller. Now we know that my PC is intaking 88CFM, and it is exhausting 102CFM. My PC case is exhausting 14 more CFM than my intake fans are pushing in(not counting the PSU). This means that inside my case there should be a suction, making the exhaust fans work a little harder.
QUESTION>>>>>>> I'm not an expert on fans and I don't know my science either. Should you have more intake or more exhaust? How does that work? Is my setup fine? Should I have more intake or more exhaust? Should I add an intake fan to the bottom of my case right in front of the PSU? Is it a problem that my H100i's two fans are my intake fans also?
I know this is a long thread, but I like for you to have the facts, and I really want someone knowledgeable to answer these questions for me. This build I have cost major cash, and I'd like to have it setup right.
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