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How many watts is enough to power my build?
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A 500w PSU is enough, but make sure you grab a quality piece from a good manufacturer. I recommend Antec, Corsair, Seasonic or XFX. Here's a great PSU at a good price:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&Tpk=xfx%20550w&IsVirtualParent=1
Or if you're on a budget:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027&Tpk=cx%20500w&IsVirtualParent=1 
This is what I do.
First Google a review of the GPU you plan on buying, ie GTX 650ti;
Then Look at the Max power (Make sure it says SYSTEM
ie GTX 650ti runing metro 2033 = approx 250 Watts
Ref: http://www.anandtech.com/show/6359/thenvidiageforcegtx650tireview/19
Then add 100 Watts to that value = Min PSU should be 430>450 Watts.
500>600 Extra cussion
NOTE if You plan on runing two GPUs in SLI/Xfire at a later date Then you should google that and add 150 Watts. Except for sli/xfire using the high end gpus a 650 Watt PSU is normally a fine choice.
Next and JUST as important is the Brand/model.
DO NOT buy anything less than a tier 3 PSU, Personlly I limit my choices to tier 2 (tier 1 are great, but generally at a premium cost.)
Tier List: http://www.eggxpert.com/forums/thread/323050.aspx  solved How many watts is enough to run this build?
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For a system using a single GeForce GTX 650 Ti BOOST 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 one 6pin PCI Express supplementary power connector.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C  50°C ambient temperature, is the 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.
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