Acceptable PSU

I currently have Corsair 650M. It’s about 8-10 yrs old. Wondering what a good wattage I should use. If I should stay with 659 or go to 750. I’m also considering upgrading to 32 GB RAM hoping these will solve my sim crashes at random parts of flights.

Run a dxdiag (START dxdiag enter) and post it here as dxdiag.txt.pln
Will have a look.