PC Power & Cooling Silencer MkII 750 Watt Power Supply
Author: Frank Stroupe
Editor: Shawn Knight
Date: 08-17-2010
Provided by: OCZ Technology
Pages:
A Closer Look


The PC Power & Cooling Silencer Mk II 750 is packaged in a sharp looking black box, literally covered with graphics, features, and specs. The box is fairly heavy for a 750 watt PSU, weighing in at six pounds.


Open the box and you find the power supply protected not only by heavy foam but is in a fabric bag.


The Silencer MK II series is a departure from typical PC Power & Cooling power supplies, in that it has a single large fan (135mm) rather than the traditional dual 80mm fan cooling design that PC P&C first created and most companies used with high performance PSUs for the first half of the last decade. They decided to go with the new design to use a smaller form factor and to make the PSU even more quiet.

PC P&C went with a matte black finish. No, the PSU is not modular, PC Power & Cooling does not build modular power supplies. The cables are finished in black mesh, and appear long enough to be used in the largest case, the longest of which are a full 40” long. Long cables make cable management much easier, and they often are too short to do really good cable management in full towers.

The logo label is very attractive and is on both sides of the PSU, configured so that it will be properly oriented either in a top mounted or bottom mounted application.


The connectors are all as heavy duty as I've seen; the SATA connectors are all 90 degree styled which look so much nicer than the straight-on style. They are far enough apart that if you have just one optical and one hard drive you should be able to use only one SATA cable. There are four Molex and four SATA per cable. There are four PCI-E cables, 2 x 6-pin, and 2 x 6+2-pin. There is an 8-pin ATX+12v and a 4-pin one. Not quite two 8-pin to accommodate the new upper end X58 motherboards such as the MSI board I am using in the test rig, but the two should suffice for nearly all Core i7 980X users. The PCI-E connectors are red as usual.

The fan is a 135mm dual bearing thermally controlled fan.


The rear of the PSU is fairly typical with single large fan power supplies, with wide open honeycomb openings for maximum airflow. There is an I/O switch but no voltage switch, as the Silencer MK II has automatic switching.

As we see on the specs label, PC Power & Cooling did not depart from another one of their traditions with the Silencer Mk II… they firmly believe in a single +12v rail. They believe that multiple +12v rails inefficiently distribute power between the rails. For example, a typical PSU in the 750 watt range has four +12v rails with 20A each. One rail supplies the CPU, two rails supply the video cards, and the remaining rail supplies the SATA and Molex connectors. What if you only have one video card? What if you only have a couple of drives connected to the SATA/Molex connectors? What if you are using one of the new Core i7 980X 6-core CPUs which would prefer more than 20A?

A single large rail ensures that each component gets enough current, and none is bottled up where it can't be used. It is also a more expensive way of building a power supply.



I would expect total and complete overkill from a company like PC Power & Cooling. Peering inside of the power supply, we definitely see overkill. The two Chemi-Con electrolytic capacitors filtering the output from the active PFC circuit are the largest I've seen inside a power supply, they are Japanese-made (the best in the business) and are rated at 105C (most companies use 85C). The secondary also uses Chemi-Con electrolytic. The transient filtering stage has twice as many capacitors as necessary, adding longevity and reliability.

Without boring you with the details, the Silencer Mk II uses better than needed or necessary MOSFETs, diodes, and switching transistors. The PSU uses a synchronous design in its secondary; it utilizes MOSFETs rather than Schottky rectifiers in order to greatly increase efficiency.

Heatsinks are large and numerous, though some of them nearly aren't needed considering the higher temperature capacity of some of the components.


Included with the Silencer Mk II 750 is a heavy 14ga power cord, some fabric/Velcro wire ties, and some thumbscrews. This is the first power supply I have owned that came with thumbscrews, even PSUs costing more than twice as much as this one.


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