RM850 good?

Specs in my signature. Currently running enermax 500w. Is it even need for new psu? What about cx750m? Gonna be good upgrade or just waste of money?
 
My current unit has 7-8 years, ELT500AWT. No issue so far nor it is noisy. I am not sure, if I am on the safe side with current PSU, that is why I am thinking about upgrade.
 
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