Enermax NoiseTaker 475 PSU

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POSTSCRIPT: Tests Repeated after Changes to PSU Test Platform

Further examination of the new PSU Test Platform, and consideration of readers' feedback resulted in two changes to the Thermal Simulation Box:

  • The addition of a low airflow 80mm exhaust fan on the "back panel" beneath the PSU.
  • The four 80mm fans that move the heat from the Load Tester to the Thermal Simulation box are now set to run at 5V rather than 12V.

The end result should be a terst platform that more closely resembles quiet low airflow PC mid-tower. Please read the Postscript in the New PSU Test Platform article for full details.

In the meanwhile the Enermax NoiseTaker 475 was tested all over again with the changed test rig. As before, ambient conditions during testing were 22°C and 17 dBA.

Enermax NoiseTaker 475
DC Output (W)
65
90
150
200
250
300
400
470
Case Temp (°C)
27
27
29
31
34
35
37
39
PSU Exhaust (°C)
28
28
30
32
37
39
40
44
Fan Voltage (min/max)
3.0/6.0
3.0/6.0
3.0/6.6
3.1/6.8
5.8/10.5
7.5/11.5
11.5/11.5
11.5/11.5
Noise, min (dBA/1m)
21
21
21
21
32
35
44
44
°
Case Temp (°C)
27
27
30
34
35
35
37
39
PSU Exhaust (°C)
28
28
31
36
38
39
40
44
Fan Voltage (min/max)
3.0/6.0
3.0/6.0
3.1/6.6
3.8/7.1
5.9/10.7
7.5/11.5
11.5/11.5
11.5/11.5
Noise, min (dBA/1m)
21
21
21
24
32
35
44
44

The data in the light green is from the previous test. The data in yellow is the new test results after the changes. It's interesting to note that neither the higher or lower power levels were affected by the change. It is the greyed out 150~250W middle range that is most affected.

1. Comparing the 150W power levels, the new Test Rig configuration is getting a bit hotter a bit sooner, but we're only just beginning to see the difference here.

2. At the 200W level, the difference is more marked. Temperatures for both case and exhaust are 3~4°C higher in the new Test Rig config, fan voltages significantly higher, and the noise audibly higher.

3. At 250W, the thermals are only marginally higher in the new Test Rig config, and beyond that, there is no change.

The fan ramp-up transition phase begins earlier and is more stretched out that with the previous test config. It is not a big change, but one that will make it a bit tougher for PSUs to stay cool and quiet to higher output levels.

Apologies for any confusion...

* * *

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