Articles: Cases/PSU

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And here’s what you’ll find included with the PSU:

  • CPU power cable with two connectors, 8-pin and 4-pin; 50cm

  • Two cables with three Molex connectors on each; 49cm+15cm+15cm
  • One cable with three Molex connectors; 34cm+15cm+15cm
  • One screened cable with a filter and one Molex connector; 60cm
  • One screened cable with a filter and a 6-pin graphics card connector; 50cm

  • Two cables with two SATA power connectors on each; 55cm+15cm
  • Adapter from two Molex connectors to a single 6-pin graphics card connector (for SLI and CrossFire systems)
  • Adapter from a Molex connector to two floppy power connectors

The two screened cables with built-in filters look interesting. They are designed similar to cables from OCZ that you have seen in our earlier reviews: there is a ferrite ring and a couple of capacitors at the end of a cable which form a simple LC filter to suppress high-frequency interference. The efficiency of the filter is dubious, but why not if it doesn’t make things worse?

The characteristics of this model are like those of the previous one: the combined current on the +12V rail is limited to 30A (with short-term peaks up to 35A) while the load capacity of the +5V and +3.3V rails is high and their combined allowable power is an impressive 280W (it is usually no higher than 200-220W and even 150W in the latest PSU models). So this product looks a hybrid between versions 1.2 and 2.0 of the ATX12V standard.

The most thrilling accessory included with the power supply is the panel to display temperatures and fan speeds.

The panel shines in blue, showing one temperature and indicating the fact that one fan is rotating (I can’t say it shows the speed of the fan since there is not a number here but an animated icon). The panel looks very elegant.

Among the three fan connectors of this power supply, two are meant to control the PSU’s own fans and the third to connect an external fan that will get the same voltage as is supplied to the PSU’s 120mm fan. The two 2-pin connectors below the fans’ ones are the outputs of temperature sensors, one of which is located on the heatsink with the diode packs and the other measures the air temperature inside the PSU case.

The panel allows controlling only one fan and only one temperature – you choose them by attaching the panel to the necessary connectors. The PSU manufacturer, however, does not recommend to adjust manually the speed of the 120mm fan. They say it is already quiet enough, and you may overheat the PSU by setting the fan speed too low. This is why if you remove the plug from the 120mm control connector (it is sealed with a warranty sticker), the PSU warranty is automatically shortened from two years to one.

Many other power supplies combine manual adjustment with automatic thermal control, but the SUNNU550 divides them sharply: the fan is managed automatically when the panel’s knob is in the extreme position (or if the panel is not attached at all) and manually at any other position of the knob.

Besides the fan control function, the panel also features a Smart Protection output. It is attached to the appropriate PSU connector and switches the PSU fans to automatic control (irrespective of the position of the panel’s knob) if the heatsink temperature is over 70°C. Moreover, if the temperature is higher than 90°C or the fan speed is below 400rpm, the panel emits a warning squeak and blinks a warning symbol at you.

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