Secondary Analysis

Like OCZ StealthXstream 600 W and OCZ GameXstream 700 W this power supply uses eight Schottky rectifiers on its secondary. On Zalman ZM600-HP and OCZ GameXstream 700 W and they are all the same model: MBRP3045N. This is really unique, as usually power supplies use a different rectifier for each output. Four of them are used for the +12 V output, two of them are used for the +5 V output and two of them are used for the +3.3 V output – even though the +3.3 V output uses a separated rectifier, it is connected at the same transformer outputs as the +5 V line.

OCZ GameXstream 600 W uses four MBRP3045N and four MBR2045CT and this is the main difference between this power supply and the other two. The four MBR2045CT rectifiers are used to produce the +12 V output and they have a lower maximum current/power (20 A vs. 30 A). 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 15 A per diode or 30 A per device (rated at 100º C). Four our calculations we need to consider only one of the diodes per device, since bith are not active at the same time. This means that in theory the +12 V output is capable of delivering up to 60 A (720 W), the +5 V output is capable of delivering up to 30 A (150 W) and the +3.3 V output is capable of delivering up to 30 A (99 W). 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 17: The eight Schottky rectifiers used on the secondary.

On Figure 19 you have a better picture of the heatsink used on the secondary.

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Figure 18: Secondary heatsink.

There is a thermal sensor located under the secondary heatsink. You can see this thermal sensor on Figure 19 (we removed the secondary heatsink to take this picture).

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Figure 19: Thermal sensor.

This power supply uses Taiwanese electrolytic capacitors from Teapo and OST rated at 105º C on its secondary. This power supply uses exactly the same capacitors as OCZ GameXstream 700 W and OCZ StealthXstream 600 W.

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