Adding SSD drive for OS is a good way to speedup old P4 machines. Even on SATA PCI controller that SSD is faster then old PATA drives. This opinion is based on my own experience with optimizing old P4/2GB PC (Linux installed). This kind of PC can be a free NAS server on which you have a better control (NAS in IT shops is based generally on closed software). Additionally you can install on it DLNA server, local proxy for WWW or pi-hole service (ad preventing on Web pages based on DNS request blocking).
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Adding SSD drive for OS is a good way to speedup old P4 machines. Even on SATA PCI controller that SSD is faster then old PATA drives. This opinion is based on my own experience with optimizing old P4/2GB PC (Linux installed). This kind of PC can be a free NAS server on which you have a better control (NAS in IT shops is based generally on closed software). Additionally you can install on it DLNA server, local proxy for WWW or pi-hole service (ad preventing on Web pages based on DNS request blocking).