Antec NeoHE Modular 550w PSU



The Antec Neo HE is the first unit to pass through the new and improved OC3D PSU Stress Tester. The tester is capable of placing loads on the following rails:

+3.3v - 20a Load
+5.0v - 20a Load
+12v1 - 10a Load
+12v2 - 10a Load
+12v3 - 10a Load
+12v4 - 10a Load
(or 40a on a single +12v rail)

The results are collected from a Mastech MAS-345 Multimeter which logs its readings via RS232 to a PC.

The load voltages will be taken after 15 minutes on the PSU Tester - any longer than this becomes a slight problem as the Stress Tester's Resistors hit around 150°c each (and there's 8 of them!).

3.3v Rail 5v Rail

During the tests, the +3.3v rail was actually bang on 3.33v when idle, and only dipped to 3.26v when under load. However, the 5v rail appeared to suffer quite a large drop in voltage when placed fully under load.

12v1 Rail 12v2 Rail

12v3 Rail

All three +12v rails of the Neo HE were stressed at the same time under a total load of 30a (10a per rail). The results were pretty impressive with all rails managing to stay within 3% of their idle voltages. The lowest rail at 11.74v shouldn't cause any issues for components in your system, but its a shame that adjustable pots are not a feature of this unit as they would certainly come in handy.


Either i'm going deaf or this unit is totally silent! During testing i was forced to place my hand at the back of the unit to see if the fan was pushing air through several times. Only when all of the rails were tested together (total 70a load) did the unit emit a silent whisper.

This is where the 'High Efficiency' of the unit comes in to play. The unit managed to remain cool, and keep the fan speeds low under high load, which means that very little energy was turned into heat during the conversion from AC to DC voltage.
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