How much watts can PSU handle?

Hello everyone.. im looking for PSU and i dont know how much watts i must to by and if can handle it.. my currently system is :

2 x evga gtx260 (in sli mode)
2 hard drives 500gb each (in raid mode)
1 dvd drive
mobo: asus striker II formula
cpu: intel core2 Q6600

I also doing overclocking for my CPU and i want the maximum performance.. i thinking of 850w or 1000w PSU but 1000w PSU are very expensive.. will 850w could handle for my requirements or i must to go for more watts? :??:
thank you....
3 answers Last reply
More about watts handle
  1. Avery good PSU that I suggest you:
    Corsair 850HX:

    Otherwise this one:
    Corsair 750TX:

    1st one is modular.
  2. 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.

    Corsair, PC Power & Cooling, and Seasonic are some 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.
  3. A good 650 watt PSU, Corsair 650TX (52 amp 12 volt rail):
    will be more than adequate. The only problem is that the 650 only has two PCI-e power connectors so you would need to use adapters.

    The 750 watt Corsair has enough power connectors so that you do not need the adapters.
    Corsair 750TX (60 amp 12 volt rail)
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