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Seasonic SS-300TFX Power Supply Review

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Manufacturer: Seasonic
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Introduction and Features


Seasonic has an excellent reputation for producing quiet ATX style PC power supplies with high efficiencies and stable outputs.  Seasonic also has a full line of server style power supplies in both 1U and 2U form factors and a new 300W TFX model.  The TFX form factor is used by the majority of Micro ATX and Mini-ITX Media Center PCs and Home Theater PCs.

Seasonic SS-300TFX PSU

Seasonic SS-300TFX Main Features:

•    Complies with TFX12V v2.31 specification

•    80Plus Bronze certified

•    Pentium 4 12V connector

•    Forward converter circuit design

•    High efficiency and reliability

•    Low AC ripple and noise

•    Super low noise fan control

•    Short circuit protection on all outputs

•    Over voltage protection

•    Over power protection

•    100% Hi-pot tested

•    100% Burn-in, high temperature cycled On/Off

•    Patented active transient load 

PSU Testing Methodology

Establishing an accurate load is critical to testing and evaluating a PC power supply.  PCPerspective’s power supply test bench can place a precise 2,000 watt DC load on the PSU under test.  Each power supply is tested under controlled, real-world conditions up to its maximum rated load, using both 115 VAC and 240 VAC line voltage.  Our current suite of tests includes:

•    DC Load Regulation

•    DC Line Regulation

•    DC Cross-load (unbalanced load)

•    AC Ripple and Noise

•    Power Factor

•    Efficiency

•    Differential Temperature

•    Noise


The Seasonic SS-300TFX was evaluated on both features and performance.  A full range of equipment was used to test the power supply under controlled load conditions. 

•    (2) CSI3710A Programmable DC load (+3.3V and +5V outputs)

•    (4) CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)

•    Extech MultiMaster MM570 digital multimeter (Accuracy ±0.02%)

•    Extech 380803 Power Analyzer (Accuracy ±0.5% of full scale)

•    Hitachi V-650F 60 MHz dual trace oscilloscope (Accuracy ±3%)

•    Powerstat Variable Autotransformer, 1.4 KVA, 0-140 VAC

•    Extech Model 407750 digital sound level meter (Accuracy ±1.5 dB)

•    Custom PC60 enclosure to simulate real-world operating conditions


July 19, 2012 | 09:52 AM - Posted by Manuel (not verified)

The utilitarian steel gray enclosure measures 175mm L, 85mm W, and 70mm H (6.9" x 3.3" x 2.8") google

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