Seasonic PRIME Series 750 W Review

Name: Seasonic PRIME Series 750 W
Brand: Seasonic

crmaris

on Nov 7th, 2016,

in Power Supplies.

Manufacturer: Seasonic

Protection Features Evaluation »

Ripple Measurements

You will see the ripple levels we measured on the rails of the SSR-750TD in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements - Seasonic SSR-750TD
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	8.8 mV	5.4 mV	8.6 mV	3.6 mV	Pass
20% Load	10.5 mV	5.5 mV	8.3 mV	4.2 mV	Pass
30% Load	12.2 mV	5.3 mV	8.9 mV	4.4 mV	Pass
40% Load	11.9 mV	5.8 mV	8.7 mV	4.4 mV	Pass
50% Load	9.4 mV	5.4 mV	8.6 mV	4.6 mV	Pass
60% Load	8.7 mV	5.8 mV	8.8 mV	5.3 mV	Pass
70% Load	8.9 mV	5.8 mV	8.9 mV	5.8 mV	Pass
80% Load	9.5 mV	6.3 mV	9.0 mV	6.3 mV	Pass
90% Load	10.3 mV	6.4 mV	9.3 mV	6.8 mV	Pass
100% Load	11.1 mV	6.6 mV	10.3 mV	7.8 mV	Pass
110% Load	12.6 mV	7.0 mV	10.5 mV	8.0 mV	Pass
Crossload 1	8.9 mV	4.4 mV	7.1 mV	3.7 mV	Pass
Crossload 2	10.6 mV	4.6 mV	7.0 mV	5.6 mV	Pass

Ripple suppression is jaw-dropping, and it has been achieved without using bulky cables equipped with extra ripple-filtering caps, like Super Flower does. Seasonic showed how it is done here, and other manufacturers will have to admit the Prime platform's superiority. Amazingly tight load regulation, even more amazing efficiency levels, and great ripple suppression are the necessary trio of features for a top-notch PSU.

Ripple at Full Load

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