Component Analysis

Before reading this page, we strongly suggest looking at this article, which will help you better understand the insides of a PSU.



The 850W unit has black heatsinks while this one has silver ones. Apart from that, the platform is the same but for a few different parts because of the lower capacity. We find a half-bridge topology and an LLC resonant converter on the primary side, and MEIC used a synchronous design and DC-DC converters for the minor rails on the secondary side.


The transient filter is complete. There is also an MOV for protection against power surges.


A discharge IC in the transient filter provides a small efficiency boost.


The NTC thermistor protects against large inrush currents and is supported by a bypass relay.


The two bridge rectifiers can handle up to 30 A combined.


The APFC converter uses two NCE Power FETs and a single JF boost diode. The bulk cap is by Chemi-Con. A bulk cap with a 420 V rating would have been ideal.


The APFC controller is a Champion CM6500UNX.


The two NCE Power primary switching FETs are installed in a half-bridge topology.


The resonant controller is a Champion CM6901T6X.


The main transformer is next to the parts for the LLC resonant controller.


Like the 850 W unit, the FETs regulating the +12 V rail are hidden by a pair of heat sinks attached to the main ones through screws. I didn't want to remove them because I might need the PSU for future measurements. As such, I couldn't identify the 12 V FETs at top of the PCB.


The electrolytic caps on the secondary side are by Lelon. There are also eight polymer caps from the same brand.


Two DC-DC converters generate the minor rails.


The standby PWM controller is a PR8109T IC, and the 5VSB secondary rectifier is an SP10U45L SBR.


The supervisor controller is a Weltrend WT7502R.


Two polymer and six electrolytic caps on the modular PCB further reduce ripple.


Soldering quality is great!


This is the same fan as in the lower-capacity PG-M units. It is supposed to have a high-quality hydraulic bearing. However, having taken it apart in the P750GM review, it uses a plain rifle bearing instead. Still, a rifle bearing is far better than a plain sleeve one.