PC Power and Cooling Silencer MKIII 1200W Review
The manufacturer behind the black 140mm fan responsible for cooling the Silencer MKIII 1200W power supply is Hong Hua; not a very well-known manufacturer of cooling fans. They made sure to let everybody know that this is a ball bearing fan. From its model number (HA1425M12B-Z) we found that it has a very high maximum rotational speed (up to 2000RPM), which hopefully it will never reach during operation.
PC Power and Cooling entrusted Super Flower to be the OEM of their new high performance power supply, which is strange as they rarely ever chose any other OEM than Seasonic. Super Flower has a good reputation as a high performance power supply manufacturer, so we do not expect the switch to cause unrest between the company's fans. The assembly quality however is discernibly lower to that of most Seasonic designs; a clean layout and lots of glue do ensure the mechanical cohesion of the power supply but the soldering job is mediocre, even poor considering the class of this power supply.
The filtering stage starts on the back of the A/C receptacle, where a small PCB holds two Y capacitors, one X capacitor and one filtering coil. On the main PCB we find two more Y capacitors, two more X capacitors and a second filtering coil, forming a pretty basic filtering stage. Unfortunately, there is no surge arresting MOV installed. The company claims that this design does not need one and we agree, these designs are very tolerant against surges; however, we also believe that it is always more secure to have one installed, especially since the cost is not higher than a few cents.
After the medium sized APFC coil and the two input rectifiers which are installed on their own small black heatsink, we find the two large primary capacitors. One unique thing about this power supply is that the two APFC capacitors are asymmetric, with one being rated at 400V/560μF and the second at 400V/680μF. Both are supplied by Nippon Chemi-Con.
The secondary side forms a synchronous rectifier, with no less than ten transistors forming it. Only a 12V line is generated; the 3.3V and 5V lines are being converted from the initial 12V line down to their respective values. The DC to DC conversion circuits can be seen on the vertical daughterboard after the secondary stage heatsink, with the metallic braces serving as EMI shields from and to the rest of the power supply.