3. A closer look
The power supply utilizes a single 12V rail design to deliver most of the power for the unit. In terms of key features we have a unit which has one +12v rail rated for 99.5A/1194W, a -12V (0.5A/6W,) the 3.3V and 5V rails are capable of 20A each with a combined maximum output of 100W and a 5VSB also rated at 2.5A/12.5W.
The maximum combined output of the PSU is 1200 watts:
The Silencer Mk III is providing plenty of cables and connectors. Native cables include that of the 20+4 pin Main, two ATX 4+4, and two PCI-E 6+2 pin cables. Modular cables are provided in the form of four more PCI-E 6+2 cables, three SATA cables with four connections each, and one Molex cable with four connectors. A Molex to FDD adapters is also also included:
Below you see a picture of the internal of the PSU:
The components and their arrangement on the PCB contribute to an overall clean layout.
The MK3S1200 is based on a half-bridge topology along with an LLC resonant converter for added efficiency. The secondary part of the main transformer includes a synchronous rectification circuit along with two VRMs for the generation of the minor rails.
As you see in the picture above, a pair of heatsinks run the length of the unit and separate the three main sections of the PSU: 1) the Active PFC (APFC) section (right side), which is actually a AC/DC converter controls the current supplied to the PSU so that the current waveform is proportional to the mains voltage waveform; 2) the transformer section (middle), which isolates primary from secondary side and converts (steps down) the voltage which feeds the secondary rectifiers that generate all DC outputs (+12V, 5V, 3.3V, 5VSB, -12V) and; 3) the output rectifiers and filters (left side) , which rectify and filter the high frequency switching waveform created by the MOSFETs and fed through the secondary of the main transformer.
In the APFC section, two Infineon fets chop the incoming rectified DC signal and, along with two boost diodes and the PFC transformer, generate a DC bus of around 380V. Two hold up caps are provided by Nippon Chemi-Con with the bigger one having 680 μF capacity while the smaller one has 560 μF capacity. Both capacitors are rated at 105°C, 400V, KMQ series).
Where appropriate components are given extra stability by white adhesive and wiring it tied in place and plastic separators.