theoretically, 500 watt is more than enough for 6700K and 960.
the question is if your power supply can do that in real life and for how long.
To have an educated opinion, a PSU model would be required.
Its an Iranian power supply the green company 535 w model :GP535A
Also it is a famous company here is the site
http://www.green-case.com/products/power/