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Efficiency, Temperature & Noise

Efficiency

Our efficiency testing procedure is detailed here.

Using results from the previous page, we plotted a chart showing the SSR-600TL's efficiency at low loads, and loads from 10 to 110 percent of its maximum-rated capacity.

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The PSU's efficiency is very high under both light and normal loads.

Efficiency At Low Loads

In the following tests, we measure the SSR-600TL's efficiency at loads significantly lower than 10 percent of its maximum capacity (the lowest load the 80 PLUS standard measures). The loads we dialed were 20, 40, 60, and 80W. This is important for representing when a PC is idle, with power-saving features turned on.

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Test #	12V	5V	3.3V	5VSB	DC/AC (Watts)	Efficiency	Fan Speed	PSU Noise	PF/AC Volts
1	1.171A	0.491A	0.476A	0.199A	19.304	79.277%	0 RPM	<6.0 dB(A)	0.779
12.156V	5.041V	3.344V	5.035V	24.350	115.34V
2	2.427A	0.991A	0.985A	0.398A	39.795	86.688%	0 RPM	<6.0 dB(A)	0.904
12.156V	5.041V	3.344V	5.030V	45.906	115.32V
3	3.610A	1.486A	1.464A	5.026A	59.305	89.879%	0 RPM	<6.0 dB(A)	0.944
12.166V	5.041V	3.343V	5.026V	65.983	115.29V
4	4.860A	1.984A	1.973A	0.797A	79.715	91.769%	0 RPM	<6.0 dB(A)	0.965
12.164V	5.041V	3.343V	5.021V	86.865	115.26V

With 20W load, the PSU's efficiency is close to 80%! This is something we rarely see, despite the large number of samples that pass through our lab.

5VSB Efficiency

The ATX specification, along with CEC, ErP Lot 3 2014 and ErP Lot 6 2010/2013, states that 5VSB standby supply efficiency should be as high as possible, recommending 75 percent or higher with 550mA, 1A, and 1.5A of load. The PSU should also achieve higher than 75% efficiency at 5VSB under full load, or with 3A if its max current output on this rail is higher than 3A.

We take six measurements: one each at 100, 250, 550, 1000, and 1500mA, and one with the full load the 5VSB rail can handle.

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Test #	5VSB	DC/AC (Watts)	Efficiency	PF/AC Volts
1	0.100A	0.493	73.692%	0.058
4.935V	0.669	115.26V
2	0.250A	1.232	78.074%	0.130
4.930V	1.578	115.26V
3	0.550A	2.706	80.344%	0.240
4.920V	3.368	115.26V
4	1.000A	4.906	80.797%	0.343
4.906V	6.072	115.25V
5	1.500A	7.335	80.889%	0.404
4.890V	9.068	115.26V
6	2.500A	12.143	79.999%	0.464
4.857V	15.179	115.25V

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The 5VSB rail is highly efficient, matching the SSR-600TL's overall performance.

Power Consumption In Idle And Standby

In the table below, you'll find the power consumption and voltage values of all rails (except -12V) when the PSU is idle (powered on, but without any load on its rails), and the power consumption when the PSU is in standby mode (without any load, at 5VSB).

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Mode	12V	5V	3.3V	5VSB	Watts	PF/AC Volts
Idle	12.239V	5.040V	3.345V	5.039V	4.118	0.335
115.4V
Standby	0.054	0.005
115.3V

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This PSU consumes low energy levels at idle, something that really helps the 5VSB rail's efficiency, especially under light loads.

Fan RPM, Delta Temperature, And Output Noise

Our mixed noise testing is described in detail here.

The first chart below illustrates the cooling fan's speed (in RPM), and the delta between input and output temperature. The results were obtained at 37°C (98.6°F) to 45°C (113°F) ambient temperature.