Secondary Analysis

Like Zalman ZM600-HP and OCZ GameXstream 700 W this power supply uses eight Schottky rectifiers on its secondary, however the rectifiers are different and here lies the difference between OCZ StealthXstream 600 W and these other two power supplies. While on these other two power supplies all eight Schottky rectifiers are identical (MBRP3045N), OCZ StealthXstream 600 W uses four MBRP3045N, two for the +5 V output and two for the +3.3 V output, and four MBR2045CT for the +12 V output.

So the main difference between OCZ StealthXstream 600 W and the other two power supplies based on the same design is the +12 V output.

Each MBRP3045N rectifier can handle up to 30 A (rated at 100º C) while each MBR2045CT rectifier can handle up to 20 A (rated at 135º C). This means that on OCZ StealthXstream 600 W the maximum theoretical current for the +12 V output is of 80 A or 960 W, while OCZ GameXstream 700 W and Zalman ZM600-HP have a maximum theoretical current for the +12 V output of 120 A or 1,440 W – in theory these two power supplies are capable of delivering 50% more current (and thus power) on their +12 V outputs compared to OCZ StealthXstream 600 W.

Since these three power supplies use the exact same rectifiers and design for the +5 V and +3.3 V outputs, the maximum theoretical capacity is the same: 60 A (or 300 W) for the +5 V output and 60 A (or 198 W) for the +3.3 V output.

As we said earlier, the maximum power the power supply can deliver depends on other components used – like the transformer, coils, capacitors, the PCB layout, the wire gauge and even the width of the printed circuit board traces.

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Figure 12: The eight Schottky rectifiers used on the secondary (four on each side of the heatsink).

This power supply has a thermal sensor located under the secondary heatsink, which controls the fan speed according to the power supply temperature. You can see this thermal sensor on Figure 13 (we removed the secondary heatsink to take this picture).

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Figure 13: Thermal sensor.

This power supply uses Taiwanese electrolytic capacitors from Teapo, CapXon and OST. The big electrolytic capacitors from the active PFC circuit is rated 105º C like all other smaller capacitors are rated 105º C.

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