Please suggest a PSU

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Speedy Gonzales
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PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($59.99 @ NCIX US)
Total: $59.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-10 16:46 EDT-0400)


Gold Certified \ Full Modular

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($59.99 @ Newegg)
Total: $59.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-10 16:47 EDT-0400)
 

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Typically to calculate the amount of power you will need you take the CPU and GPU max TDP add them together, and double it. You double since most PSU's are most effecient at about 50% load, and the other components have a little bit power draw. The i7 4790 has an 84w max TDP and most nVidia gfx cards are around 170w. If your estimated use is 443w I would go with 500w with high efficiency. The higher the efficiency the longer your components will last.

P.S. Im not sure what kind of draw an AMD card will give you, but it is usually a bit higher than nVidia and Intel.
 


^ These ^ are 2 excellent picks.

Another good one, bronze modular, is:

http://pcpartpicker.com/part/rosewill-power-supply-hive650

Notice too that all 3 recommendations are 650w, even though you're only pulling in the 450-500 range right now.

You want a little overhead for GPU power draw and also to keep you in the 40-70% range for best PSU efficiency and longevity.
 

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