Power Supply Roundup: 730W to 900W

Silverstone OP850 - 850W

We have seen already two other versions of this unit before in the 650W class. The 850W version doesn't differ too much, and from the outside it looks the same. On the inside, however, there are plenty of changes, including a new topology. The power supply comes in a black housing with a large 120mm fan.

As we have seen before the OP850 has just a single 12V rail which supports up to 70A.

Cables and Connectors

All the cables are sleeved as usual. The mesh starts outside of the power supply which is not as attractive. If a company pays for the additional costs of adding sleeves, they should do the job correctly and start the mesh inside the power supply chassis. Other than aesthetics, though, there's no disadvantage in this approach. The cable harnesses are very long and have a maximum length of 110cm for the floppy connectors and 100cm for the Molex connectors. There are six Molex and SATA connectors, which is enough though a few more wouldn't have hurt.

The inside is nicely arranged and makes a good impression. There are two large heatsinks that reach from front to back. The fins are thick and should provide ample cooling. However, our measurement of up to 90°C in the heat-chamber is quite high. With an exhaust temperature of just 58°C, it appears the airflow isn't removing heat from the heatsinks. Instead, heat builds up inside the housing, which is not the intended result. Still, the power supply did complete our tests and we couldn't find any major problems.