You should be fine.
I had that exact PSU and ran a Phenom x4 and 5770/5750 Crossfire just fine and I am pretty sure that took more watts than a single 660 with an A10.
These VP-450's are probably the best sub $40 PSU's around.
Pretty sure they have 85% efficiency.
So yea, no worries about that PSU in my opinion.
My only advice would be to not overclock anything very much.
And no it never died, I upgraded to a CX600 and use it for a 550ti/Athlon x2 build for guests.