It’s been a while since the last time I discussed the location of the chassis fan. The scent master finally freed up the next experiment. This time we will replace the previous tower radiator with a lower-pressure radiator to study different CPUs. How to use the cooling method to match the number and position of the chassis fan.
testing platform
This test is still using the last configuration, due to the use of the down-pressure radiator, I will adjust the CPU heat through bios to ensure the maximum effect of the experiment.
After several experiments, I finally set the multiplier of the Core i7-7700K to 40. After all, the performance of the aluminum bottom-pressure radiator is not comparable to that of the heat pipe tower radiator. The FPU single-bake mode of AIDA64 is also turned on during the test. And FurMark's 1080P grill mode, the test time is 20min.
In addition, in the last test we have come to the conclusion that 'the chassis fan is installed in the back position is the best effect', this time saved a lot of effort.
Test directly from the three best performing locations, These three positions are in the middle of the front panel 360mm fan position (can bring low temperature air to the graphics card and CPU).
The top plate 240mm corresponds to the position above the CPU heat sink (takes away the air that rises through the CPU and the graphics card) , and the best effect of the back 120mm fan position. The chassis uses the HuntKey GX600P tower chassis.
Under the pressure of the radiators for testing from three overclocking 'Jaws haoyue smart Edition', as an integral aluminum heat sink under the pressure, it provides 57CFM fan air volume, maximum speed up to 1800RPM.
The chassis fan is also equipped with the '皓月 RGB streamer fan' from overclocking three, which are installed in the front panel and the top plate respectively, and a 4pin interface overclocked three RGB fan installed in the back 120mm fan position.
Different positions, the number of chassis fans on the CPU, graphics card temperature
Because the air duct formed by the down-pressure radiator and the tower radiator is different, the lower-pressure radiator absorbs air from the top of the radiator and then blows 360° to the periphery, taking away the heat on the fins, and the components around the CPU, the hardware will Have a greater impact.
Some netizens mentioned that the lower-pressure radiator is beneficial to the power supply module and the heat dissipation of the memory. This is not true. When the heat generated by the CPU is small, the lower temperature of the wind blown from the heat sink is beneficial to the heat dissipation of the surrounding components, but when the CPU temperature is high, the hot air will affect other components.
Next, I will conduct 5 environments for testing: 1 blank experiment, only the 120mm fan works on the back; 2 compare experiment 0, stop all chassis fan work; 3 compare experiment 1, open the front panel and back chassis fan; 4 contrast experiment 2, Open the top and back chassis fans; 5 compare experiment 3, open three chassis fans at the same time.
Blank experiment (back 120mm chassis fan operation)
This experiment is mainly based on the conclusions of the previous article "": The single chassis fan fashion works best at the back 120mm position.
The current temperature of the CPU top cover is 82 ° C, the maximum temperature is 82 ° C, and the current temperature of the four cores is in the range of 88-82 ° C. The current temperature of the graphics card is 60 ° C, the maximum temperature is 71 ° C. This test video card The temperature is similar to the last time. It can be said that the entire test adjustment has not changed much.
Comparative Experiment 0 (no chassis fan operation)
This experiment is to tell everyone whether there is a chassis fan on the CPU, the temperature of the graphics card.
Unfortunately, when the test went to 4 minutes and a half less than the Core i7-7700K, there have been individual core downsizing. Of course, this is also expected by the scent master. Here is the main point for everyone to see when there is no chassis fan. There is a frequency reduction.
It can be seen that the current temperature and maximum temperature of the CPU top cover are both 89 °C, which means that the CPU is still heating up, and the other three cores have actually exceeded the 100 °C down-conversion line, and then returned to 98, 99 ° C. The current temperature and maximum temperature of the graphics card have reached 75 °C.
Contrast experiment 1 (120mm on the back, 360mm intermediate fan on the front panel)
In the previous issue, the front panel 360mm installation fan has the best cooling effect in three positions. This time, the fan is directly installed at this position for testing. In theory, the two chassis fans can form a horizontal air duct. , while sending low temperature air to the CPU graphics card, the other side will draw warm air out of the chassis.
However, the fact is cruel. After adding the front panel chassis fan, the current temperature of the CPU top cover reaches 83 ° C, and the maximum temperature is 84 ° C. The current temperatures of the four cores are 93 ° C, 92 ° C, 88 ° C, 91 ° C. The temperature of the graphics card has also increased, the current temperature and maximum temperature is 71 ° C.
Contrast experiment 2 (120mm on the back, 240mm left fan on the top)
After experiencing the counter-effects of the previous round of tests, the scent master is also worried. This experiment directly uses two fans to pump hot air out of the chassis, I don't know how it works.
Sure enough, an exhaust fan can bring a good cooling effect. The current temperature of the CPU top cover is 79 ° C, and the maximum temperature is 80 ° C. The temperature of the four cores is within 86-89 ° C. The temperature of the graphics card also drops. The current temperature is 69. °C maximum temperature of 70 degrees Celsius.
Comparative Experiment 3 (three chassis fans are turned on at the same time)
In the last experiment, it was natural to use three fans. Let's see what happens to the two fans and one fan.
It seems that the front panel's inlet fan really can't bring any cooling effect to the hardware. The current temperature and maximum temperature of the CPU top cover is still 83 ° C. The current and maximum temperature of the graphics card is 70 ° C. It is a comfort without heating up.
Data aggregation and analysis
We analyzed the blank experiment and comparison experiment 1 and the comparison experiment 2 and the comparison experiment 3. It is not difficult to see that the inlet fan of the front panel can not cool the interior of the chassis, but the counter effect is obtained. The temperature of the CPU and the graphics card is improved a lot. Comparative experiment 2 , 3 even has a 4 ° C difference, the front panel of the chassis fan is indeed a big drag on the hind legs.
Conclusion 1:
The intake position of the down-pressure radiator is different from that of the tower radiator. The air it absorbs mainly comes from the hot air passing through the graphics card. The air volume provided by the front panel causes more hot air to rise to the air intake position of the CPU radiator.
It can be said that the function of the front panel fan is to blow hot air to the CPU heat sink to cause more 'heat accumulation'.
Conclusion 2:
When there is a chassis fan, the temperature data of the video card does not change much. From the blank experiment and the comparison experiment 1, we can clearly see that the fan on the front panel does increase the 'heat accumulation' near the CPU and the graphics card. In contrast experiment 3, the amount of airflow is increased, and the 'heat accumulation degree' near the graphics card is reduced. The exhaust fan is more effective for cooling the graphics card.
Conclusion three:
Through the blank experiment and the comparative experiment 3 analysis, more than one chassis fan can effectively reduce the internal temperature of the chassis, but more than one fan cooling effect is not as good as 'have, no'. The back 120mm chassis fan has remarkable effect.
to sum up
For a computer with a push-down radiator, the function of the inlet fan is to increase the 'heat accumulation' of the chassis, and only achieve the opposite effect. Of course, when installing the chassis fan of the front panel for decorative effects, consider using small Fan of the wind volume.
In order to reduce the internal temperature of the chassis, a strong exhaust fan must be used. The effect is most significant from 0 to 1 time. The more the exhaust fan can get the greater the cooling effect, but the smaller the change. After reading this article, I think it’s also a matter of heart, knowing how much to install the chassis fan and the location.
