Efficiency

Using the efficiency results from the previous page, we plotted a chart showing efficiency of the AX760 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 AX760 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.


The AX760 plays in its own field at such low loads; it simply destroys the competition. With a 40 W load, the PSU registers a stunning 84% reading only to reach 91% at 100 W! These efficiency readings are simply outstanding, which proves that this unit can combine the best of all worlds – high efficiency at low, normal, and high loads.

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 each at 100, 250, and 1000 mA, and one with the full load that the 5VSB rail can handle.


The 5VSB circuit performed well since it easily surpassed the minimum allowed efficiency levels that the ATX spec specifies on all tests. Also, the unit fairly easily broke the 80% mark with a full load, which is noteworthy for this rail.

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 very low. The unit easily meets the ErP Lot 6 2013 requirements. More and more units are, lately, ErP Lot 6 compliant because of the advanced standby PWM controllers they utilize.

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 showing the cooling fan's speed (RPMs) and its output noise follows. We measure the fan's noise from a distance of 1 meter; the background noise in our lab was close to 30 dBA during testing.