I need your help to undertand if 750W PSU is enought to my system or if it's better to have a 850W PSU
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Solved by seon123,
The Prime TX would be a downgrade from the HXi. Coil whine is harmless and is not any indication of a failing PSU, just annoying. Before even considering a new PSU, you could contact Corsair and see if they would still replace it, though.
Seasonic likes to cheap out on the fan and protections, so the Prime uses a crappy Hong Hua fan (in my desktop, that's the loudest part of the system at idle and under load), and it lacks multi rail OCP. The HXi has a decent fan, and it has configurable multi rail OCP. If you want to get custom cables, there would also be more options available for the HXi.
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