FSP Hydro PTM 650W Power Supply Review

Crmaris October 23, 2018 Featured Tech Reviews, Power Supplies, Reviews

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the HPT650M’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test	12V	5V	3.3V	5VSB	Pass/Fail
10% Load	29.0 mV	6.9 mV	6.9 mV	10.4 mV	Pass
20% Load	17.8 mV	4.8 mV	6.2 mV	16.0 mV	Pass
30% Load	15.9 mV	5.7 mV	7.1 mV	18.3 mV	Pass
40% Load	16.6 mV	5.5 mV	7.2 mV	19.9 mV	Pass
50% Load	17.9 mV	6.6 mV	8.3 mV	19.3 mV	Pass
60% Load	19.2 mV	7.4 mV	8.8 mV	18.1 mV	Pass
70% Load	19.0 mV	7.7 mV	10.1 mV	16.4 mV	Pass
80% Load	20.2 mV	8.0 mV	11.2 mV	20.4 mV	Pass
90% Load	21.8 mV	8.6 mV	11.7 mV	19.4 mV	Pass
100% Load	23.5 mV	9.3 mV	12.1 mV	19.4 mV	Pass
110% Load	24.7 mV	9.9 mV	13.2 mV	19.4 mV	Pass
Crossload 1	17.9 mV	7.6 mV	10.9 mV	7.1 mV	Pass
Crossload 2	23.5 mV	7.5 mV	8.8 mV	11.4 mV	Pass

The ripple suppression is very good on all rails.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.