More information needed:
Update your post to provide additional information about the pc freezes.
For example are the freezes completely random or do the freezes occur only while gaming or using some particular app?
Include full system hardware specs and OS information.
What is the make, model, wattage, and age of the current PSU? History of heavy use for gaming, video editing, or even bit mining.
Disk drive(s): make, model, capacity, how full?
Look in Reliability History and Event Viewer. Either one or both may be capturing error codes, warnings, or even informational events just before or at the time the pc freezes.
What is your budget?