What Sort of PSU Should I Use?

I've been looking through all the PSU caluclators however they all seem to give me different results (Up to 200w diffrence)
My build is (Will be)
-i7 3770K
-ASrock Z77E Mini Itx
-Gtx 660 ti
-2x 4gb Sticks Of DDR3 Ram
-1x 1tb WD 7200 rpm hdd
-1x DVD-RW
What wattage am I looking at all up?
2 answers Last reply Best Answer
More about sort psu
  1. For a system using a single GeForce GTX 660 Ti graphics card NVIDIA specifies a minimum of a 450 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 24 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.

    Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
  2. Best answer
    A good 450W or better supply will do the trick.

    The xfx 550w is excellent
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