Enermax ECO80+ 620W PSU Review

Features:

• 24/7 @ 40C operation capable

• MAGMA Fan uses Batwing Blades to improve airflow by 20-30% and a Twister Bearing to reduce noise by 1-2 dBA

• Safeguard utilizes OCP, OVP, UVP AC, UVP DC, OPP, OTP, SIP and SCP.

Specifications:

Testing:

In order to effectively test the ECO80+ 620W, we installed it into what we consider to be a typical system for this class of power supply.  We will take a look at both idle and load numbers, both in software and with a DMM.  Below is the system we used:

Our main test test uses the popular software OCCT, which stresses the CPU and the GPU simultaneously, and then graphs the voltages over the period of an hour.  Below are the graphs for 3.3V, 5V, and 12V rails:

In the above graph, the green line represents the CPU load, and the brown line represents the actual voltage measurement.  In the case of the 3.3V rail, there is very little variance.  The rail wiggles a little bit when idle, however the lowest value measured 3.3V, and at max measured 3.31V, all well within the defined spec. 

The 5V rail was very stable, showing a minimum of 5.05V and a maximum of 5.075V, meaning the rail was rock solid through testing. 

The 12V rail was less stable, with an obvious difference between idle and load.  This is largely because the 12V rail is what is responsible for powering both the GPU and the CPU, meaning the load is much more stressful on this rail as opposed to the other rails.  The lowest value measured was 12.225V, while the highest value measured was 12.35V.

During the load portion of the test, the 12V showed a variance of roughly 50mV, well within the spec of 100mV.  It could be less, but it is difficult to tell without a more thorough hardware testing platform. 

Because software testing doesn't have the best visibility to the actual voltage measurement coming from the power supply, I like to confirm results with a DMM.  To do this, I measure the 12V rail in one of the PCI-e plugs as it is plugged into the video card.  I measure at idle when the system is sitting at the desktop, and then again during the OCCT stress test.  In both cases the probing is done for several minutes to look for any variation.  Here are the results:

As you can see, the DMM confirms what OCCT sees nearly perfectly.  The rail is a little on the high side, but well within spec.