Save money with energy-efficient electronics

What is efficiency:

The efficiency of a computer power supply is its output power divided by its input power. The remaining power is converted into heat. For instance, a 600-watt power supply with 60% efficiency running at full load would draw 1000W from the mains and would therefore waste 400W as heat. On the other hand a 600-watt power supply with 80% efficiency running at full load would draw 750W from the mains and would therefore waste only 150W as heat.

What is 80 PLUSĀ® Certified PSU:

80 PLUSĀ® specifies internal form factor voltage outputs, as well as Bronze, Silver, Gold, and Platinum criteria levels for energy efficiency and power factor.

For a given power supply, efficiency varies depending on how much power is being delivered. Supplies are typically most efficient at between half and three quarters load, much less efficient at low load, and somewhat less efficient at maximum load. Older ATX power supplies were typically 60% to 75% efficient. To qualify for 80 PLUS, a power supply must achieve at least 80% efficiency at three specified loads (20%, 50% and 100% of maximum rated power). However, 80 PLUS supplies may still be less than 80% efficient at lower loads. For instance, an 80 PLUS, 520 watt supply could still be 70% or less efficient at 60 watts (a typical idle power for a desktop computer). Thus it is still important to select a supply with capacity appropriate to the device being powered.

It is easier to achieve the higher efficiency levels for higher wattage supplies, so gold and platinum supplies may be less available in consumer level supplies of reasonable capacity for typical desktop machines.

Efficiency Certifications:

80 PLUS Test Type on 115V Internal Non-Redundant

Fraction of Rated Load

20%

50%

100%

80Plus Base80 PLUS

80%

80%

80%

80+Bronze80 PLUS Bronze

82%

85%

82%

80+Silver80 PLUS Silver

85%

88%

85%

80+Gold80 PLUS Gold

87%

90%

87%

80+Platinum80 PLUS Platinum

90%

92%

89%

 

What is 80 Plus Power Supply and Why is it important:

http://www.ecoinsite.com/2009/05/green-it-glossary-80-plus-power-supply.html

 

What it means to you:

Greener computing with higher energy efficiency

Quiet and maximized performance through reduced thermal output

Save money on electricity

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