OCZ StealthXStream 2 600 W Power Supply Review

The fan of choice is a favourite with most power supply manufacturers lately, another 12 cm Yate Loon unit, which is a 12V 0.30A product.

A top down view of the internal structure of the OCZ power supply. This PSU is using two GBU606 rectifying bridges which are connected in parallel and to the same heatshink which is shared by the switching transistors.

These bridges can actually support up to 6A at 100c which in theory would mean that at 80 percent efficiency you should be able to get over 1,100W without any serious damage. If of course the rest of the components were up to the task, which they obviously aren't. This PSU has a total of eight Schottky rectifiers which are attached to the secondary heatsink – all of these rectifiers are MBR3045CT designs which offer 30A maximum current. The older unit used a MBR2045CT combination of rectifiers which only delivered a maximum 20A of current for the 12V output. The power supply is feeding four seperate rails.

The Transient filtering stage can be seen in the picture above. The X and Y Capacitors which make up the second part of the filtering stage can also be seen in close proximity. The primary is controlled by a CM6800 active PFC/PWM combined circuitry panel. The outputs are monitored by a PS223 integrated circuit which supports both under voltage and over voltage protection. It also protects against over current and over temperature situations if they ever occured.

The StealthXStream 2 600W has two transistors in the active PFC circuit and the older one actually had three. This is based around two SPA20n60C3 mosfets and each of these is capable of handling 20.7A at 25c. The electrolytic capacitors available in the secondary unit are Teapo units with a maximum rating of 105C.

The cabling is sleeved well into the unit which is always good to see, this means no possible friction can occur on the bare wires as it enters the chassis. The internal design is clean throughout and the soldering is generally of a very high standard.

The heatsinks that OCZ are using are quite large for a supply with this power output and the relevant areas are shielded. We also noted slightly stronger SPA2060C3 Mofsets used in the switching section which are stronger than the original unit design (around 18A at 25c – they are now 20.7A).

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