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How We Test Power Supply Units

Voltage Regulation Test

A PSU should be able to keep all of its rails within some predefined voltage ranges at all cases/loads. In Table 1, you will find these ranges (following the ATX v. 2.4 specification).

DC Output Voltage Regulation

Voltage NameRangeMinimumNominalMaximum

Here's an example of a voltage regulation test results chart you'll find in each of our PSU reviews:

Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.