A Detailed Look
The SilverStone Platinum Series 550W power supply enclosure is painted with a satin black finish and trimmed with white logo and nameplate. The compact chassis measures 140mm (5.5”) deep. The back panel includes an AC receptacle, master power On-Off switch and an open honey-comb grill.
The power supply uses a Globe Fan 120mm fan for cooling. The fan (S1202512L) is rated for 0.18A at 12 VDC and features a fluid dynamic bearing bearing for long life and quiet operation. The ST55F-PT power supply features an intelligent fan controller that allows semi-fanless operation. The fan does not start spinning until the power supply reaches at least a 20% load.
The front panel on the 550W PSU incorporates nine modular cable connectors, all nicely labelled and color coded.
All of the modular cables are flat ribbon-style to assist with neat cable routing and to help maximize airflow.
SilverStone uses remote voltage sensing on the ST55-PT to help insure tight load regulation. You can see the remote sense wires attached to the main 24-pin ATX cable in the photo below.
Under the Hood
Here are a few pictures showing the layout and components inside the Platinum Series 550W power supply. SilverStone is using High Power as the OEM for the Platinum Series. The overall layout, soldering, and build quality all look very good.
The power supply features a modern circuit design to deliver high efficiency and uses DC-to-DC converters to produce the +3.3V and +5V rails from the +12V output.
All of capacitors used inside the PSU are Japanese made with a good mix of electrolytic and solid polymer caps used throughout. The main primary electrolytic capacitor is made by Rubycon and rated for 470uF, 400V and 105°C.