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Articles: Cooling/PSU

Real-time Pricing and Availability:
Enermax (EG851AX-VH) 660-Watt Power Supply Products

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The specified parameters are a lucky combination of versions 1.2 and 2.0 of the ATX12V standard. On one hand, the max current on the +12V rail may be as high as 29A (as demanded from the typical 400W ATX12V 2.0 unit), but on the other hand, the combined load on the +5V and +3.3V rails may be as high as 240W which corresponds to the capabilities of ATX12V 1.2 units (I want to remind you once again that the max load on these rails was greatly reduced in the newer version of the standard; it is not required to exceed 130W for a 400W unit).

The PSU offers you these cables:

  • Mainboard cable with a 24-pin connector (you can detach a 4-pin part to plug the connector into an older mainboard), 45cm long
  • ATX12V cable with a 4-pin connector, 47cm long
  • Graphics card cable with a 6-pin connector, 46cm long
  • SATA cable with two connectors, 45cm+15cm
  • Two cables with 4 Molex and 1 mini-plug on each (45cm from the PSU to the first plug and then 15cm more to each next plug)

The PSU is cooled by a 12cm DFS122512L fan from Young Lin Tech Co., Ltd. When the PSU is shut down, the fan still works for some time at a low speed, feeding from the standby +5V source.

The stability of the output voltages is acceptable, with two drawbacks – the +5V voltage is originally set too high and the +3.3V voltage lacks stability.

Under a load of 450W the output voltage ripple amounted to 34 millivolts on the +5V rail and to 37 millivolts on the +12V. Both are within the acceptable limits.

The fan is not very fast, speeding up to only 1400rpm even at the max load. As I said above, the fan continues to work for some time at a low speed and cools the PSU after the unit has been shut down.

The efficiency parameters of this PSU are typical: an efficiency factor of about 80% (this is more than the industry standard demands, but less than many other PSUs can offer) and a power factor of almost 1.

The Hiper Type R 480W has the characteristics of a good power supply and is quite competitive against rivaling products from other manufacturers. My only concern is about the soldering quality – it is downright poor where some elements were soldered to manually.

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