What would be a good Wattage for my build

[GordoSloth]

So I literally have all my parts including my power supply but I have some concerns with the amount of power my system would need
Specs:
P9 X79 Pro MotherBoard
Gigabyte R9 280x
Intel i7 4820k
Corsair H100i
3 TB WB Black
120 GB Samsung SSD
Also many Misc Fans for cooling and other thing accessories like LEDs.
But my thing is I bought a 650 watt PSU not thinking, but now I am skeptical, I still have time to return the PSU but I want to know if i need a new one or if 650 watts or going to be enough for this build

 

[jimthenagual]

650W is more than enough, even 550W would be enough provided it is from a quality PSU maker. What make/model did you buy?

 

[Dark Lord of Tech]

A QUALITY 650W will easily power your specs.