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.


Ripple Testing

Since voltage output is not the only concern when it comes to quality DC output we next examined the ripple and regulation characteristics of the LEPA MX F1 600W. We examine these points since unnecessary ripple can cause premature failure of sensitive components in a number of different PC subsystems.

The DC output quality was logged via our digital oscilloscope and the EasyScope II software package. Each divider horizontally represents 2ms while each divider vertically represents 0.05v or 50mv. The ATX specification states that a unit should remain at or below 120mV of ripple and noise on the 12v rail while under 50mV on the 3.3v/5v rails.

Control Test Graphing

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This image is the blank background control test on an unused connector from our SM-8800 during the LEPA MX F1 600W testing. This lets us determine what the background noise looks like during testing. If at any time a trace deviates from this reading that is the noise/ripple being logged by the oscilloscope for that rail. As you can see the trace is flat and shows as a blue line obscuring the axis. If during a test the axis becomes visible but a waveform is hard to discern it is most likely due to the amplitude of the trace being small in relation to our voltage divider.

120v and 100v Input

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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. In Test #1, we see the MX F1 600W starting off with somewhat active traces as the peak amplitudes are ~30mV for the 12v rails, ~15mV for the 5v rail, and ~10mV for the 3.3v rail.

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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 just catastrophic collapses by this units filtering as the 12v rails end at ~600mV of ripple/noise, the 5v rail at ~240mV, and the 3.3v rail at ~40mV!

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

DC Output Quality Summary

A picture is worth a thousand words, so just go ahead and take a second to look back at those pictures above.

So after looking at those pictures again there just isn't much more to say about the results posted by the LEPA MX F1 600W as it was hitting 5x the ATX12v specification limit on the 12v and 5v rails at 50% load. 50% of the rated output and it did this badly!

The only thing that might make the above results any better is the fact that the other sample we had did worse than this. This is bad on such a different level that it is hard to convey the results I think. If you remember back to the $20 PowerTek Pro 500W from 8 years ago, this unit does worse in this regard than that unit did. This unit is worse than a no-name, 8 year old, $20 power supply! That means this unit does not even manage to rise to the level of the Diablotek PHD650 or Ultra X2 750W Exploding Edition in this part of our testing.