SilverStone Nightjar NJ450-SXL PSU Review

1. Introduction2. Packaging, Contents & Exterior3. Teardown & Component Analysis4. Load Regulation, Hold-Up Time & Inrush Current5. Efficiency & Temperature6. Protection Features & DC Power Sequencing7. Cross-Load Tests & Infrared Images8. Transient Response Tests9. Ripple Measurements10. EMC Pre-Compliance Testing11. Performance, Value, Noise & Efficiency12. Final Analysis13. View All Pages

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/ Bottom	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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