Friday, January 27

Power Requirements. Components ( The Bare Skinny )


Introduction

There seems to be a lot of confusion around how big a power supply your computer needs. Previously I have covered what 80 Plus means. This time I wanted to detail roughly how much power each component in a computer could require.

The following values are for power requirements under load. While your computer is idling they will be much lower.

When deciding which power supply to purchase add up the power requirements for all components you plan to install in your new computer. Divided the total by 6, then times that total by 10. And you should have a power supply which will work at optimal efficiency when your computer is working hard.



The Bare Skinny

  • CPU
    • Intel
      • Core i7-E
          • 130W - 150W
      • Core i7
          • 77W - 95W
      • Core i5
          • 73W - 95W
      • Core i3
          • 55W - 73 W
    • Amd
      • 8 Cores+
          • 95W - 125W
      • 4 Cores
          • 65W - 125W
      • 2 Cores
          • 65W - 95W
  • Motherboards
    • Regular
          • 25W - 40W
    • Gaming
          • 45W - 80W
  • Memory
    • DDR1 (2.5v)
          • 4W - 5.5W
    • DDR2 (1.8v)
          • 3W - 4.5W
    • DDR3 (1.5v)
          • 2W - 3W
    • DDR4 (1.2v)
          • 1.5W - 3W
  • Video Card
    • Low End
          • 25W - 86W
    • Mid End
          • 110W - 164W
    • High End
          • 162W - 258W
    • Top End
          • 240W - 350W
  • Hard Drives
    • SSD
          • 0.5W - 3W
    • 2.5" Hard Drive
          • 0.7W - 3W
    • 3.5" Hard Drive
          • 6.5W - 9W
  • Optical Drive
          • 15W - 30W
  • Case Fans
      • 80 mm
            • 0.6W - 3W
      • 120 mm &
        140 mm
            • 1W - 6W

    80 Plus Certification. Power Supply ( The Bare Skinny )


    Introduction



    80 Plus is a voluntary certification program promoting efficient engergy use. It certifies that the products have better then 80% efficiency at 20%, 50%, and 100% of rated load. Power supplies certified 80 Plus waste 20% or less energy at specified load levels.




    Description

    Having a more efficient power supply means less power is wasted as heat. Your power supply's efficiency varies depending on the demands being put on it. Generally a power supply is most efficient between 40% to 60% load.

    Most of the time your computer will be idling. Ideally you want your idle power draw 30%-40%, and max draw fall between 70%-70% of your power supply's rated wattage.


    The Bare Skinny




    • 80 Plus
      • 80%
        • Bronze
      • 85%
        • Silver
      • 87%
        • Gold
      • 90%
        • Platinum
      • 92%
        • Titanium
    1. 80 Plus tests are performed at room temperature (23°C).
      Power Supply efficiency lowers the hotter it is.
    2. 80 Plus rating does not guarantee a power supply's quality
    3. Power supplies degrade over time

    Power Supply Rails ( The Bare Skinny )


    Introduction


    What are "Rails" and should I care how many my Power Supply has? You may have noticed when choosing a power supply for your computer, that there are a lot of different things to think about. One of the most commonly overlooked/misunderstood specs is the difference between "Single Rail" and "Multi Rail" power supplies.




    Description

    When the manufacturers say their power supply is "Single" or "Multi" rail, they are referring to how many zones they have divided the power supply in for Over Current Protection. The Over Current Protection chip monitors each zone/trace your power supply provides and will shut down the power supply if one of the zones uses to much current.



    The Bare Skinny
    • < = 500 Watts ( or Approximately 40A )
      • Single Rail
    • >   500 Watts
      • Multi Rail
    • >   850 Watts
      • Multi Rail ( Required )