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.


Transient Testing

The Transient Testing portion of this review marks the first revision to our living testing methodology. Readers can read more about this inclusion in our testing here in our methodology section, but briefly we will be examining the response of the power supply to a short duration load such as a RAID array spinning up or load change due to power draw from video cards etc. Ideally we would not see a deflection from the baseline voltage output when this occurs but that is simply not the case for the majority. We will be using the ATX12v specification for transient response as a guide.

The Transient Load Tester adds an additional 9.25A to the 12v rail for 10ms and an additional 3.75A to the 5v rail for 10ms at 25% total load and 50% total load.


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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 before the addition of the transient load. The results of Test #1 show a ~790mV drop on the loaded 12v rail and ~300mV drop on the loaded 5v rail with a rebound of 150mV putting this unit above the ATX12v limit of 5.25v. At the same time that 12v load was being triggered, the 5v rail measured a ~250mV drop while the unloaded 12v rail measured a ~70mV drop.

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 were unable to begin Test #2's Transient Load Test.

Transient Load Testing Summary

The Transient Load Test results for the LEPA MX F1 600W are failing on multiple levels which, as one would imagine, is an impressively bad feat! Why is that you might ask? Well, the unit died before Test #2 could be completed here so that was step one. Step two of the MX F1 600W's trip into the wall/fence that makes Mike Conway's (and yes, I know Indy is not F1) look like a peaceful Sunday cruise was the fact that the unit went out of specification during Test #1, that is at just 25% load! It is also not like it was just a little out of specification either. No, the loaded 12v rail posted a peak drop of 790mV. That is 0.79v! It was so far out of specification it isn't even funny and then things got worse as, when the 5v load was applied to the 5v rail, the 5v rail dropped by 300mV and then rose by 150mV putting that rail out of specification too! This unit literally could not do one thing right in this test and I don't think any unit we have ever had has done that before!