Seasonic Prime Fanless 700 W Review

Name: Seasonic Prime Fanless 700 W
Brand: Seasonic
Price: 266 USD

crmaris

on Jan 3rd, 2022,

in Power Supplies.

Manufacturer: Seasonic

Efficiency »

Test Setup

Primary Rails Load Regulation

The following charts show the voltage values of the main rails, recorded over a range from 60 W to the maximum specified load, and the deviation (in percent) for the same load range. Tight load regulation is an essential characteristic for every power supply because it allows for constant voltage levels despite changes in load.

5VSB Regulation

Load regulation is tight at +12 V, but not the other rails. Apparently, the high operating temperatures I applied during testing affected the performance of the VRMs for the minor rails.

Ripple Measurements

Ripple represents the AC fluctuations (periodic) and noise (random) found in the DC rails of PSUs. Ripple significantly decreases the life span of capacitors because it increases their temperature; a 10 °C increase can cut into a capacitor's life span by up to 50 percent. Ripple also plays a vital role in overall system stability, especially when it is overclocked. According to the ATX specification, the ripple limits are 120 mV (+12V) and 50 mV (+5V, +3.3V, and 5VSB).

Ripple Measurements - Seasonic Prime Fanless TX-700
Test	12V	5V	3.3V	5VSB	Pass/Fail
10% Load	17.5 mV	7.1 mV	6.1 mV	6.9 mV	Pass
20% Load	17.7 mV	7.6 mV	6.1 mV	7.4 mV	Pass
30% Load	16.9 mV	8.2 mV	6.4 mV	7.8 mV	Pass
40% Load	11.2 mV	8.7 mV	6.7 mV	9.0 mV	Pass
50% Load	10.3 mV	9.2 mV	7.3 mV	8.7 mV	Pass
60% Load	11.2 mV	10.6 mV	10.4 mV	9.3 mV	Pass
70% Load	13.2 mV	11.5 mV	11.8 mV	9.6 mV	Pass
80% Load	14.9 mV	11.8 mV	14.8 mV	10.9 mV	Pass
90% Load	15.5 mV	11.6 mV	15.3 mV	9.3 mV	Pass
100% Load	23.2 mV	12.0 mV	16.1 mV	12.2 mV	Pass
110% Load	25.5 mV	12.8 mV	17.6 mV	12.4 mV	Pass
Crossload 1	19.4 mV	9.8 mV	15.3 mV	6.0 mV	Pass
Crossload 2	16.1 mV	9.7 mV	6.6 mV	6.0 mV	Pass
Crossload 3	15.3 mV	8.7 mV	19.8 mV	5.8 mV	Pass
Crossload 4	23.9 mV	12.2 mV	17.4 mV	11.1 mV	Pass