Which case keeps cooler?

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When it comes to cooling, you should look for a case that supports good airflow. This is very important.

Good Airflow usually means:

1.) Front Intake Fan (80mm or 120mm)
2.) At least 1 Rear Exhaust Fan (120mm)
3.) Possibly a side panel intake or exhaust fan (80mm)
4.) Wire Management - Very important! This will ensure airlfow. Hide, zip tie, wire sleeve, etc... all wires that used in the centeral area in and around cooling devices.
5.) Room Temp - If you live in a desert with no AC. It doesn't matter what case you have... You will have very little cooling.

You want fresh cooler air to be drawn inside the case, which will mix with the ambient warmer air inside the case, cooling the ambient air and then the rear exhaust fan will remove the air.

For proper cooling of internal components like (CPU, GPU, HDD'S) you're ambient temp inside your case must be at least 10C cooler then you're components that you are trying to cool.

If your CPU is 40C you case temp should be no more then 30C.

This is primary due to the "HEAT DISSIPATION" cycle.

Continously mixing cooler air with warmer air...
 
That first case would have the best ventilation out of the three, but not that great.

I only have a cheap case, but it's a good example of one with good ventilation.

In these pictures, notice that I have:

- Front vent to allow air to come in and a place to mount a 120mm fan in the front.
- Large side vent with fan to blow in fresh air near the CPU fan.
- Rear vents with 120mm fan mount.

In this picture, notice the front vents and large side vents.
http://i8.photobucket.com/albums/a48/speed_demon1965/DCP_2725.jpg

In this picutre, notice the front and rear 120mm fan mounts. Though I don't have fans yet, I will. The front will pull fresh air in and the rear will push the warm out out.
http://i8.photobucket.com/albums/a48/speed_demon1965/DCP_2721.jpg
 
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