Testing

     We are going to test this power supply by measuring the volts with a multimeter.  We will not use any software monitoring programs.  Some of you may be curious and want to measure your own rails.  The +12v and +5v is easy, any spare molex connector will do.  The 3.3v is a little harder.  This requires measuring through the main power connector.  Here is a diagram that will show you exactly were to put the test leads.

     The actual testing will be done at idle and load on a default system and then again with the same system overclocked.

Results

Conclusion

     The power supply performed very well.  The results were very consistent and the voltages never dipped below the rating of the rail.  This is very important when overclocking and just when running your computer.  If your 12v rail dips down in the 11v range you're risking a system crash.  420w is getting on the small side of things as far as power supplies are concerned, but the Enermax 420w power supply should be more than adequate for most computer systems.