Introduction

We would like to thank Kingwin for supplying the review sample.

Although it's easy to find many Platinum certified power suppies on the 80Plus website, their availability in the market is very limited at this time. The first platinum PSU that was widely available is the LZP-550 from Kingwin. This unit is based on Super Flower's Golden King 550W and according to Kingwin up to 550W output it meets Platinum standards but if needed it can deliver 650W with Gold efficiency. A PSU that officially can be overclocked and still keep Gold efficiency.

A very interesting feature of the LZP-550 is that its fan will not spin up until the temperature inside the unit reaches 65-70° Celsius, so most of the time, depending on the load of course and on the ambient/airflow of the case, this unit will go fanless. With platinum units, where energy dissipation is minimal, it is relatively easy to eliminate the use of the cooling fan or utilize very low RPM/noise settings. This is good news for users that seek inaudible components for their systems and without any doubt PSUs are a significant noise source.

Specifications

The price is really high for a 550W unit but on the other hand, the technology incorporated to reach Platinum efficiency and almost fanless operation does not come cheap. Warranty is pretty long at five years.


Combined power at 5V & 3.3V is among the lowest we have ever seen, with only 100W max. However today's systems do not draw much power from these minor rails so you won't have any problems, considering also that the unit's max capacity is only 550W.

Cables & Connectors, Power Distribution

The 20+4 ATX connector, along with the PCIe and EPS ones, uses 16 AWG wires while the rest use 18 AWG. The available connectors are sufficient for the capacity of the PSU and cable length is satisfactory. Our only objection is the distance between the SATA/Peripheral connectors which is quite small at 110 mm. ATX spec recommends at least 150 mm.

Since this PSU features a single +12V rail we do not have anything to comment about its power distribution.