LEPA MX F1 600W Power Supply Review

LEPA does not have much to say in terms of marketing about its new MX F1 power supply line. Outside of "Racing car style coating" and "Extremely Silent fan," we have very little to go on, except one thing. 600 watts of good PSU power priced at $49.99 with Free Shipping with be a very good value, if it's "good" power.


Load Testing

For those of you that are curious as to some of the reasoning and equipment behind our PSU testing program here at HardOCP, we have put together a living document that shares a lot of the behind the scenes of the program. The testing we are conducting today is exactly as described in that document and will begin with a range of loads tested at 120v input including our torture test and then move on to the same set of tests at 100v input but without the torture test.

120v Load Testing Results

Article Image

Test #1 is equal to approximately 25% of the rated capacity of the MX F1 600W at 45c. This makes Test #1 equal to 150W by loading the 12v rails to 10a, the 5v rail to 2a, the 3.3v rail to 1a, the +5vsb to 2a, and the -12v to 0.5a. The results of Test #1 show the main positive DC output voltages starting off above nominal with the 5v rail being the highest by absolute terms. The efficiency for this unit is starting off rather poorly for a modern unit at 78.00%. It is a good thing that this is not certified by 80 Plus it seems. The exhaust temperature is coming in at 51C to start things off today.

Test #2 is equal to approximately 50% of the rated capacity of the MX F1 600W at 45c. This makes Test #2 equal to 299W by loading the 12v rails to 20a, the 5v rail to 6a, the 3.3v rail to 4a, the +5vsb to 2a, and the -12v to 0.5a. Test #2 sees all of the main DC output voltages drop by varying amounts. The 12v rails have dropped by up to 0.04v while the 5v rail has dropped by 0.14v and the 3.3v rail dropped by 0.05v. The efficiency has dropped slightly from Test #1 levels to 77.78% while the exhaust temperature has moved up to 60C.

Following Test #2 both LEPA MX F1 600W power supplies we had failed to turn on or were dangerously out of specification. These did complete Test #2 but that was it. As such, no further testing was completed by either unit.

120v Load Testing Summary

The unit could only make it through Test #2 at 120v before giving out. In the tests it did complete, the 12v rails were doing OK, but you can already see the 5v rail heading for the border and the efficiency is following right behind it! Typically, power supplies have a peak efficiency around the 50% load mark. This unit? The efficiency peaked at 25% load and even then that peak was only 78.00%. With that all in mind, one can only imagine how the 100v load testing went, so let's go see.