Is this power supply enough?

[Chaosvenom]

I've recently gotten an AMD Phenom II X4 965 Black Edition and a MSI GTX 660 Twin Frozr Normal Edition, my power supply is 500W, on the nvidia website for a gtx 660 it says the minimum power supply is 450W and other people say a 550-550W is good enough, but the instructions manually says 550W is minimum, but this guy http://www.youtube.com/watch?v=8kWivTfhq0o who has the OC edition of 660 Ti has a 500W Power Supply, pls can somebody answer me, i don't wanna fell like i just wasted my money for nothing.

 

[swilczak]

If you bought a good quality PSU it would be fine. What brand did you get?