Yes it can.
950 has a lower power consumtion than Haswell 4770, about 100W ( I'm talking about full usage of the cpu ) , with oc it will go higher, example from a 3.4 GHz to 4.4, with additional 50-60W more.
650 Ti doesnt eat that much power. And minimum PSU that is required is 400W.
Your system will consume about 400W and with oc around 450 max!
Antec makes great PSU's and a platinum one has great efficiency!