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Energy Efficiency

80 Plus Computer Power Supply Advantages

 

 

 

 


80 Plus Computer Power Supply

How much electricity and money can be saved?

Typical energy consumption of a computer can be reduced by over 30%. See Energy Consumption Chart for a comparison.

Benefits of a 80 Plus Computer Power Supply

  • Lower energy consumption for the life of the 80 Plus computer
  • Save money from energy efficiency for the life of the 80 Plus computer
  • Lower heat created from the computer for the life of the 80 Plus computer
  • Less building air conditioning capacity needed for the 80 Plus computers
  • Lower cooling running costs for the 80 Plus computer
  • Improved computer reliability with less heat related issues and less fan noise
  • Better power factor values reduces energy costs by avoiding unbalanced loading charges by the electricity supplier.

When do I need 80 Plus?

When buying a new computer look for the 80 Plus logo and an Energy Star 4 or 5 logo.
When building a computer look for efficient processors and 80 Plus logo power supplies. Enable Computer Power Management in the BIOS and the Operating System.

What does Computer Power Management CPM achieve?

CPM turn off sections of the computer after periods of inactivity to save power. E.g.

  • Turn off screen after 15 minutes of inactivity
  • Turn off hard drives after 15 minutes of inactivity
  • Put the computer in Sleep mode or Hibernation after 30 minutes of inactivity
  • Energy Star 4 computers have CPM turned on at purchase
  • Assume CPM will save up to an extra 38% in energy consumption.

 

Energy Consumption Chart

Power Supply Efficiency (Percent) 50 55 60 65 70 75 80 85 90 95
Example Power used by computer (watts) 200 200 200 200 200 200 200 200 200 200
Energy needed by power supply (watts) 400 364 333 308 286 267 250 235 222 211
Potential cooling capacity needed for computer (Watts) 120 109 100 92 86 80 75 71 67 63
Yearly Power Consumption at 45 hrs/week (kWh) 936 851 780 720 669 624 585 551 520 493
Yearly electrical cost at $0.20 / kWh ($) 187 170 117 156 133 125 117 110 104 99
If Computer Power Management is enabled
Yearly Power Consumption at 45 hrs/week (kWh) 580 528 484 446 415 387 363 341 322 305
Yearly electrical cost at $0.20 / kWh ($) 116 106 97 89 83 77 73 68 64 61

80 Plus Details

Specification LevelEfficiency at 50% loadMinimum Power Factor
80 PLUS Bronze level87%0.9
80 PLUS Silver level89%0.9
80 PLUS Gold level92%0.9

Efficiency is tested at 10%, 20%, 50% and 100%. Efficiency from 20% to 100% load must be over 80%.

There are over 1000 80 Plus computer power supply models available.

Energy Efficient Computing Conclusion

The use of 80 Plus power supplies has a good return on investment.
The small extra cost of purchase would be returned in the first year.
Another benefit is reduced cooling capacity needed and reduced cooling running costs.
Enabling Computer Power Management is also a good way to save electricity on all computers possible.

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