OCZ EvoStream 600w Modular PSU
Now for my favourite part of PSU testing - lifting the hood and having a poke around inside! By doing this I should be able to get a good idea of the overall build quality of the unit and how it is likely to perform in our tests.
I was really surprised to see that the EvoStream was based on a dual PCB design. Normally this is only seen in high wattage power supplies that need to make full use of the casing without extending the length of the PSU. The layout of the unit seemed rather crowded but had been kept as tidy as possible with the use of cable ties.
Several aluminium heatsinks can be seen at various places on the circuit boards, the largest being at the top of the unit that has the responsibility of keeping the mosfets cool.
From the images above we can see that the upper of the two boards (pictured right) has a single transformer with a wire-wound inductor alongside. Around the other side of the board is a large bank of small capacitors rather than a one or two large capacitors as seen on most other power supplies.
The lower part of the board (pictured left) contains several more inductors along with another large aluminium heatsink cooling multiple mosfets. At the back of the board we can also see a small transformer most likely responsible for 3.3/5v transformation.
During my inspection of the EvoStream I found the logo of a company called PloTech
printed on the PCB. Normally this would indicate that the power supplies internals were produced by an industry manufacturer. However, with no previous history of PloTech manufacturing power supplies it is unlikely that they are responsible for the EvoStream.
The EvoStream also has several adjustable potentiometers (pots) on the upper PCB, which are often responsible for fine-tuning the output voltages of the unit. However, a layer of glue as been applied to the pots to prevent them from being tampered with.
The EvoStream makes use of a clear Blue LED 80mm fan manufactured by Protechnic Electrics. I was unable to find any definite figures for this fan, but a Japanese site seemed to suggest that the fan is rated at 31.9dbA at a speed of 2400rpm.
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