How much power ?

[welliam]

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

 

[kyzar]

Google 'power supply calculator' and do it yourself? There's several links on the first page...

 

[N@n0]

Any high quality 650W should be enough.
Emphasis being on HIGH QUALITY

why 4Gb 2x2Gb on the 920? it uses tri-channel memory...

 

[JohnnyLucky]

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.