What PSU do i need?

Hi i'm currently building a PC and need some advice on the PSU, i don't really know which i need, as i don't understand the whole 12v rail amps crap. So any help would be appreciated.

Currently questioning to get this - http://www.scan.co.uk/products/850w-xfx-p1-850s-nlb9-core-edition-80-plus-bronze-85-eff-sli-crossfire-eps-12v-135mm-fan

PC Build =
Msi P67A GD65
Intel I5 2500K
SLI 570's
8gb Corsair Vengeance DDR3 Ram
1TB Samsung f3 spinpoint 1gb
blu-ray drive
3- 230 x 30mm fans
1 - 140 x 25mm fan

Will need to power all that and all over peripherals (Mouse/keyboard/headset etc)

Thanks, any advice would we greatly appreciated.

Cheers.
4 answers Last reply
More about what need
  1. That one is good. Why do you need two 570 for? Kinda overkill for any game.
  2. mosox said:
    That one is good. Why do you need two 570 for? Kinda overkill for any game.


    I won't be getting the second one straight away, just want to make sure the psu was future proof, but thanks for the help.
  3. GeForce GTX 570
    On your average system the card requires you to have a 600 Watt power supply unit.

    GeForce GTX 570 in 2-way SLI
    A second card requires you to add another ~225 Watts. You need a 750+ Watt power supply unit if you use it in a high-end system (800+ to a KiloWatt is recommended if you plan on any overclocking).

    ---

    Taken from Guru3d review website, hope it helps :)
  4. You should be fine, but if you can, grab a 900w+ because when you overclock, you always want you PSU to have good clean power and not be working too hard.
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