Replacing Seasonic SSP-300SUB fan

Sun, May 19 2024 22:19:35 KST

Do not replace the PSU fan arbitrarily as it may cause safety issues.

Seasonic SSP-300SUB is a Flex ATX PSU. A Flex ATX PSU is a PSU that usually goes into a 1U server. There are also NAS cases that accommodate a Flex PSU.

If the SSP-300SUB PSU temperature is low and power consumption is low, the fan will not run at all. When using the J5040 or N100 motherboard, the power fan usually starts spinning after about 15 minutes. But, when openning a web browser or application, CPU power consumption increases rapidly, and the fan makes a loud noise for about 0.5 to 1 second, and then the fan turns slowly. I was stressed out because of that.

So while looking for a fan on Amazon, I purchased the Easycargo EDM4020B12 fan and replaced it, and I am very satisfied.

The specifications are as follows:

Air flow: (7.51 CFM)
Speed: (6000rpm)
Noise level: (23.1dBA)
Life time: (70,000 hours)
Working Voltage: (10.8-13.2VDC)
Start-up Voltage: (7V DC)
Current: (80mA)
Power: (0.6 W)

Cable length is 15cm. The 2pin specification is XH2.54. It fits the Seasonic SSP-300SUB perfectly.



The two screw holes on the fan attachment area of the PSU case protrude inward.


So the fan screw holes need to be widened a bit.


I used scissors to widen it like this. Also, the Easycago fan’s cable is not covered with protective or shrink tubing. I took out the protective tube on the Noctua A4x20 fan, separated the Easycargo fan cable pin connectors and sockets, and pushed the Easycago fan’s cable into the protective tube. Then I connected the Easycargo fan cable pin connectors and sockets.




As you can see, the work was completed very neatly. You can see the black cable starting from the fan at the bottom left, from left to right at the top of the case. The 2-pin XH2.54 standard fits the PSU perfectly. The cable length is just right at 15cm. There’s no need to cut the cable. When running the app, there is a slight noise for less than 1 second. The noise level at this time is comparable to that of a low-noise laptop. Other than that, it’s quieter.


I was curious to see if it was actually running, so I turned on the flashlight and saw that the fan was actually running. The wind actually comes out. However, the airflow is weaker than the original fan, but it does not seem to be a problem in low-power systems. However, do not replace the PSU fan arbitrarily as it may cause safety issues.