Seasonic Platinum-1000 1000 W Review

Name: Seasonic Platinum-1000 1000 W
Brand: Seasonic

crmaris

on Oct 31st, 2011,

in Power Supplies.

Manufacturer: Seasonic

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of the SS-1000XP. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements Seasonic SS-1000XP
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	23.6 mV	9.7 mV	8.5 mV	17.0 mV	Pass
40% Load	15.5 mV	8.8 mV	9.4 mV	7.7 mV	Pass
50% Load	15.8 mV	11.2 mV	9.6 mV	8.2 mV	Pass
60% Load	16.6 mV	11.4 mV	10.6 mV	10.8 mV	Pass
80% Load	20.1 mV	11.4 mV	11.4 mV	11.9 mV	Pass
100% Load	24.0 mV	12.5 mV	14.9 mV	13.6 mV	Pass
Crossload 1	37.6 mV	9.5 mV	9.7 mV	12.3 mV	Pass
Crossload 2	23.8 mV	11.8 mV	12.2 mV	22.4 mV	Pass

As expected from Seasonic's flagship PSU, ripple/noise suppression is excellent. Even at full load ripple at +12V is at one fifth of the limit. With 20% load, ripple is higher compared to other load levels because at low loads the unit works in PWM mode and only at higher loads it uses FM mode.

Ripple at Full Load

In the following oscilloscope screenshots you can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise. For all measurements we set 0.01 V/Div (each vertical division/box equals to 0.01V) as standard.