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SilverStone Nightjar NJ450-SXL PSU Review

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Hold-Up Time

Our hold-up time tests are described in detail here.

The oscilloscope screenshots that we took during the hold-up time measurements:

The hold-up doesn’t exceed 17ms, as the ATX spec dictates, however it is very close. Obviously there was no space available to install a larger bulk cap. On the bright side, the power ok signal is accurate.

Inrush Current

For details on our inrush current testing, please click here.

The inrush current is high with both voltage inputs.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the NJ450-SXL’s efficiency. The applied load equals (approximately) 10 to 110 percent of the power supplies maximum load in increments of 10 percentage points.

We conducted two additional tests.

During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a power supply is compatible with Intel’s C6/C7 sleep states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Test # 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps Top/
PF/AC Volts
1 1.941A 1.985A 1.989A 0.984A 44.879 82.690% <6.0 43.50°C 0.878
11.990V 5.040V 3.318V 5.084V 54.274 39.75°C 115.32V
2 4.872A 2.981A 2.990A 1.183A 89.340 89.813% <6.0 44.16°C 0.943
11.994V 5.034V 3.311V 5.072V 99.473 40.06°C 115.26V
3 8.212A 3.482A 3.477A 1.384A 134.467 91.673% <6.0 45.46°C 0.959
11.990V 5.028V 3.306V 5.060V 146.681 40.80°C 115.20V
4 11.553A 3.983A 3.999A 1.585A 179.689 92.219% <6.0 46.68°C 0.961
11.987V 5.023V 3.300V 5.047V 194.851 41.62°C 115.23V
5 14.562A 4.986A 5.009A 1.788A 224.988 92.324% <6.0 47.49°C 0.962
11.982V 5.016V 3.293V 5.034V 243.695 42.08°C 115.16V
6 17.506A 5.992A 6.023A 1.992A 269.494 92.260% <6.0 48.50°C 0.962
11.978V 5.009V 3.286V 5.021V 292.104 42.84°C 115.09V
7 20.521A 7.000A 7.044A 2.197A 314.810 91.743% <6.0 49.37°C 0.959
11.973V 5.002V 3.279V 5.007V 343.143 43.04°C 115.04V
8 23.535A 8.010A 8.067A 2.404A 360.100 91.473% <6.0 50.95°C 0.962
11.969V 4.995V 3.272V 4.994V 393.668 44.26°C 114.96V
9 26.953A 8.523A 8.571A 2.407A 405.001 91.231% <6.0 52.13°C 0.963
11.965V 4.988V 3.266V 4.987V 443.929 45.04°C 114.99V
10 30.308A 9.036A 9.109A 2.512A 449.729 90.847% <6.0 53.76°C 0.964
11.961V 4.982V 3.260V 4.977V 495.038 45.87°C 114.93V
11 34.064A 9.045A 9.127A 2.516A 494.535 90.353% <6.0 54.72°C 0.966
11.957V 4.977V 3.255V 4.971V 547.339 46.48°C 114.86V
CL1 0.137A 10.003A 10.001A 0.000A 84.853 87.793% <6.0 50.00°C 0.944
11.997V 5.019V 3.300V 5.095V 96.651 43.89°C 115.26V
CL2 37.511A 1.002A 0.999A 1.000A 462.176 91.585% <6.0 53.90°C 0.964
11.966V 5.001V 3.275V 5.036V 504.639 45.79°C 114.92V

The NJ450-SXL does not have any problem, at all, to deliver its full power and even more under extremely tough conditions.

We cranked up the heat inside our hotbox up to 46.5°C and the power supply operated without problems, delivering high efficiency levels. This is a great platform which looks to deliver half of its nominal power in order to be able to cope with the lack of active cooling.

The load regulation at +12V is tight, while at 5V and 3.3V is within the 2% range, so it is satisfactory. Finally, the 5VSB rail stays in the 3% range.

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