The first place we like to take a look when opening a power supply to have a hint about its quality is its filtering stage. On generic power supplies this stage has only one coil, two ceramic capacitors, one or two metalized polyester capacitors and, if we are lucky, one MOV (Metal-Oxide Varistor). This power supply from Cooler Master uses four ceramic capacitors, one MOVs, three metalized polyester capacitors and two ferrite coils, plus a ferrite bead on the main power cord. At least here Cooler Master made a terrific job.

Another very interesting feature from this power supply is that its fuse is inside a fireproof rubber protection. So this protection will prevent the spark produced on the minute the fuse is blown from setting the power supply on fire.

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Figure 9: Transient filtering stage (part 1).

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Figure 10: Transient filtering stage (part 2).