What psu to use

Hello,
Im building a new pc for gaming
Ive got a few parts already but i dont no what size psu to use.

Ive already got;

Amd phenom ii x6 1045t
Msi 970a-g46
8gb (4x2gb) pny optima ddr3 ram
1tb hdd
2 dvd-rw
About 5 fan in an xclio a380 case
Xfx radeon hd 6870 1gb
32'' full hd tv

I am getting another 6870 and crossfiring the pair @ x8x8 bandwidth
Ill be using it for gaming mainly

I will be planning on overclocking cpu and gpu when ive bought aftermarket coolers


my question is what size psu should i buy (minimum)
So i have a general idea of what to get

Thanks alot
Marc
2 answers Last reply
More about what
  1. A pair of 6870's will pull about 20 amps, peaking to 25 amps.

    The minimum power supply I would use is a good 750 watt PSU:
    Corsair TX750V2 or XFX750, both with about 60 amps on the 12 volt rail and both built by Seasonic.

    You do not really need a modular power supply because you will not have that many unused cables.
  2. Spot on thats fine, i looked at an xfx 750 for £70,
    But i wasnt sure if was ok with it only having a single 12volt rail
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