how many watts would i need for my pc?CPU: intel core i5 4670RAM: Kingston HyperX Blu Red 16GB cl10 HDD: WD Black 1TB 64

[jspeevs]

How much power is nescessary for the system above?

 

[juanjostorreshernndez]

not too much,the most important part to take into acount on power consumption is Graphics Card that make intense use of +12v rails as the CPU.
I think with a good branded certified 500W you would be fine,but if you are planning to install a GPU on the near future I recommend more, depending on the card TDP

 

[Dark Lord of Tech]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($44.99 @ NCIX US)
Total: $44.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-10-06 12:56 EDT-0400)

 

[HardwareHandyMan]

I'd probably get a 550W with 80+ gold so it uses the power more efficiently instead of turning it into waste heat.
Plus its not much more in terms of money than a 500W