How much power ?

Hello,
Please calculate for me the exact power for the following systems (no OC):

1-
Intel Core i7 920
4 Gb 2x2 DDR3
Geforce 275 GTX
2 Hard Drives Sata
1 DVD Writer

2-
Intel Core i7 860
4 Gb 2x2 DDR3
Geforce 275 GTX
2 Hard Drives Sata
1 DVD Writer


Intel Core i7 860
4 Gb 2x2 DDR3
Geforce 250 GTX
2 Hard Drives Sata
1 DVD Writer


Thanks
3 answers Last reply
More about power
  1. Google 'power supply calculator' and do it yourself? There's several links on the first page...
  2. Any high quality 650W should be enough.
    Emphasis being on HIGH QUALITY

    why 4Gb 2x2Gb on the 920? it uses tri-channel memory...
  3. The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the +12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the +12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.

    A high quality 500 to 550 watt psu will have a +12 volt rail rated at 40 amps. A high quality 700 to 750 watt psu will have a +12 volt rail rated at 60 amps.

    In addition the power supply should be at least 80+ Bronze certified for energy efficiency. There are some models available which have achieved 80+ Silver and 80+ Gold Certifications.

    Before purchasing a new psu you will need to decide whether you will eventually have a pc with one or two video cards.

    Corsair and Seasonic are two of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. One example would be the Antec Earthwatts series which is a major improvement over Antec’s older psu’s like the Basiq models.
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