Test Setup

Primary Rails Load Regulation

The following charts show the voltage values of the main rails, recorded over a range from 60 W to the maximum specified load, and the deviation (in percent) for the same load range. Tight load regulation is an important characteristic for every power supply since it allows for constant voltage levels despite changes in the load.

5VSB Regulation

Hold-up Time

Hold-up time represents the amount of time, usually measured in milliseconds, for which a PSU can maintain output regulations as defined by the ATX specification without input power. Hold-up time is the amount of time the system can continue to run without shutting down or rebooting during a power interruption. In the following screenshots, the blue line is the mains signal and the green line is the "Power Good" signal, while the yellow line represents the +12V rail.

Inrush Current

Inrush current, or switch-on surge, refers to the maximum, instantaneous input current drawn by an electrical device when it is first turned on. Large enough inrush current can cause the tripping of circuit breakers and fuses, and may also damage switches, relays, and bridge rectifiers. As a result, the lower the inrush current of a PSU right as it is turned on, the better.



Inrush current isn't that high despite the lack of an NTC thermistor.

10-110% Load Testing

These tests reveal the V750's load regulation and efficiency levels under high ambient temperatures. They also show how the fan-speed profile behaves under tough operating conditions.

Light Load Testing

In the following tests, we measure the V750's efficiency at loads significantly lower than 10 percent of its maximum capacity (the lowest load the 80 PLUS standard measures). This represents a PC that is idle with its power-saving features turned on.

Ultra-Light Load Testing

The applied load in this test is only 10 W for PSUs with 500 W and lower capacities, while for stronger units, we dial in 2% of the maximum-rated-capacity. We only run this test with 115 V input.


The V750 has over 60% efficiency with 2% of its maximum-rated-capacity load, which is high enough for me. That said, Intel wants >70%.

Efficiency

Using the results we gathered so far, we plotted a chart showing the V750's efficiency at low loads and loads from 10 to 110 percent of its maximum-rated capacity.


Efficiency levels with light loads are satisfactory, and the unit stays well behind its major competitors, both Corsair models, with normal loads.

5VSB Efficiency

Efficiency at 5VSB isn't that high. It would be nice to at least have one reading close to or above 80%.

Power Consumption in Idle and Standby

Fan RPM, Delta Temperature and Output Noise

The following results were obtained at 37–47 °C ambient.





The following results were obtained at 30–32 °C ambient.


As you can see in the graph above, the PSU's passive operation doesn't last for very long.