It should be ok, but if you don't have it yet I would go for something a little bigger in wattage, perhaps a 550-600w just for a little bit of head room, especially if you are planning on overclocking.
That psu will do, he doesn't need a 500W psu...for a 650 gtx and a pentium G860.
The maximum tdp of the card is 64 W, the cpu doesn't get more than 55W.
The total system at load will not draw more than ~150W.
Nvidia recommend for it a 400W psu.
You're fine with that psu.