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)
-ASrock Z77E Mini Itx
-Gtx 660 ti
-2x 4gb Sticks Of DDR3 Ram
-1x 1tb WD 7200 rpm hdd
What wattage am I looking at all up?
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.