Hey
Your CPU consumps 100W on max load
270x goes on 200W max ( toxic for sure )
+ 100W from all other components you are at 400W max usage
Get a 550W PSU, will be enough for your system.
A seasonic G 550W PSU is one of the best I had. Modular cables, 4 year guaranty ( if not 5 ) and It's seasonic - one of the best PSU makers.