How the Case Rear Fan Improves CPU Cooling
Tests with the Case Open
Contents
We repeated the tests with the case open, i.e., without the case left panel. Again, the only fan on the case was the rear one.
The temperatures we
re taken with the rear fan turned off, and then with it at 1,000 rpm, 2,000 rpm, and 2,700 rpm (full speed). We repeated the tests with only one fan installed on the CPU cooler, and then with both fans installed.
The following table shows our results.
| Rear Fan State | Room Temp. | CPU Temp. with Single Fan | CPU Temp. with Dual Fan |
| Off | 16 °C | 53 °C | 53 °C |
| 1,000 rpm | 16 °C | 52 °C | 51 °C |
| 2,000 rpm | 16 °C | 51 °C | 50 °C |
| 2,700 rpm | 16 °C | 50 °C | 50 °C |
In the graph below, you see the temperature difference between the CPU core temperature and the room temperature, with the case open, with different rear fan speeds. Green bars are the results with two cooler fans, and red bars represent the measures taken with only one case fan.
This graphs show that, without the left panel of the case, the rear fan also can improve the CPU cooling. In tests with both one and two fans on the CPU cooler, the rear fan dropped the temperature in three Celsius degrees when at full speed, comparing to the measure with this fan turned off.