Transient Filtering Stage
As we have mentioned in other articles and reviews, the first place we look when opening a power supply for a hint about its quality, is its filtering stage. The recommended 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, usually removing the MOV and the first coil.
Although the OCZ ZX Series 850 W has two ferrite coils, two X capacitors, and two Y capacitors more than the minimum required, it doesn’t come with an MOV, component in charge of removing spikes coming from the power grid. This is certainly a flaw on a high-end product.
In the next page we will have a more detailed discussion about the components used in the OCZ ZX Series 850 W.