Transient Filtering Stage

As we mentioned in other reviews and articles, 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. The recommend components for this stage are two ferrite coils, two ceramic capacitors (Y capacitors, usually blue), one metalized polyester capacitor (X capacitor) and one MOV (Metal-Oxide Varistor). Very low-end power supplies use fewer components than that, usually removing the MOV, which is essential for cutting spikes coming from the power grid, and the first coil.

Even though this power supply from OCZ has more components than the necessary – one extra X capacitor, two extra Y capacitors, one extra coil and a ferrite bead on the main power cable –, it doesn’t have a MOV, which is a sin. This power supply also features a X capacitor and a coil after the rectifiers.

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Figure 7: Transient filtering stage (part 1).

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Figure 8: Transient filtering stage (part 2).

A 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.

All components described on this page are identical to the ones used on OCZ GameXstream 700 W and Zalman ZM600-HP.

Now let’s have a more detailed discussion on the components used on StealthXStream 600 W.

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