Efficiency

Using the results we gathered so far, we plotted a chart showing the PSU's efficiency at low loads and loads ranging from 10 to 110 percent of the maximum-rated capacity.




In terms of efficiency, the PSU has a hard time keeping up with ETA-A+ and 80 PLUS Titanium offerings.

10%–110% Load Testing

These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures. They also show how the fan-speed profile behaves under tough operating conditions.


The cooling fan's speed dropping so low during the CL1 test despite high operating temperature looks odd. I also noticed that the PF readings are not that high, especially during high loads. Given the digitally controlled PFC converter, I expected higher PF readings.

As you will notice in the table above, there is no 110% test because I couldn't get the PSU to operate correctly at the load level. Strangely, I didn't have this problem during the OPP evaluation.

Light Load Testing

In the following tests, we measure the PSU's efficiency at loads significantly lower than 10 percent of the maximum capacity (the lowest load the 80 PLUS standard measures). This is important for representing when a PC is idle with its power-saving features turned on.


Efficiency levels with light loads are satisfactory.

Ultra-light Load Testing

The applied load in this test is only 10 W for PSUs with 500 W and less capacity. We dial in 2% of the maximum-rated capacity for all other PSUs. We only run this test with 115 V input.


This PSU is just barely below the 70% efficiency mark the ATX specification asks for with 2% load.

5VSB Efficiency

While 5VSB efficiency is high enough, the digital competition has a significant lead here.

Power Consumption in Idle and Standby

Vampire power is very low.