Efficiency

Using the efficiency results from the previous page, we plotted a chart showing efficiency of the Integra R2 750 W at low loads and at loads equal to 20-110% of the PSU's maximum rated load.



For a discussion of these results, see the text at the end of the previous page.

Efficiency at Low Loads

In the next tests, we measured the efficiency of the Integra R2 750 W at loads much lower than 20% of its maximum rated load (the lowest load that the 80 Plus Standard measures). The loads that we dialed were 40, 60, 80, and 100 W (for PSUs with over 500 W of capacity). This is important for settings where the PC is in idle mode with power saving turned on.


At low loads, the PSU managed to deliver very good efficiency levels despite its officially low efficiency rating. It scored over 80% efficiency in three out of four tests we ran; results that many Silver or even Gold efficiency PSUs will be envious of.

5VSB Efficiency

The ATX spec states that the 5VSB standby supply's efficiency should be as high as possible and recommends 50% or higher efficiency with 100 mA of load, 60% or higher with 250 mA of load, and 70% or higher with 1 A or more of load.
We will take four measurements: one at 100, 250, and 1000 mA each, and one with the full load that the 5VSB rail can handle.


The 5VSB rail surpassed the minimum allowed limits of the ATX spec on all of the above tests, but the overall efficiency of this rail is nothing to write home about.

Power Consumption in Idle & Standby

In the table below, you will find the power consumption and the voltage values of all rails (except -12V) when the PSU is in idle mode (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).


Vampire power is lower than 0.5 W. That makes this PSU ErP Lot 6 2013 compliant. Even at idle, power consumption is amongst the lowest we have ever measured.

Fan RPM, Delta Temperature and Output Noise

The cooling fan's speed (RPMs) and the delta difference between input and output temperature are illustrated in the following chart. The following results were obtained at 40°C - 45°C ambient.



A chart that shows the cooling fan's speed (RPMs) and the output noise follows. We measure the fan's noise from 1 meter away. The background noise in our lab was close to 30 dBA during testing.