PSU problem

Hey guys, I want to help me with something.I want to build a computer. I chose the parts.
cpu: intel i7 4770
motherboard:asus p87-pro
video card: gigabyte gtx 660
hdd: 500 gb
memory:8gb corsair
and I want to know if I need a 650w psu or 750 psu or even more?
 
650w is more than enough for that build and a gtx 660.
Even 500w will do, however you haven't mentioned what psu brand it is you are going to get. Go for branded and well known ones such as: Corsair, XFX, Seasonic, antec, OCZ etc.
 
The GTX 660 requires a 450W PSU or better. To stay on the safe side, go with 500W or greater. If you want to SLI in the future, get a 650W-750W PSU. Stick with brands like Corsair, XFX, Seasonic, and sometimes Rosewill. Avoid CoolerMaster and OCZ.
 
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