Im upgrading from a corsair 550w PSU to a corsair 850w is it possible to just swap out the psu's themselves without changing out the cables?
i'd swap everything. the weaker psu would have been shipped with cables that are good enough for its output. the higher power psu could possibly overpower those cables since it is designed to provide more power.
so rather than temp fate that the cables you are using are good enough for the extra power, i'd just change them all to the new ones
For people that will see that title and read this in the future:
Corsair -> Corsair = Maybe.
Between two random PSU's = No.