Adding an SSD to your PS4 will provide a significant upgrade in terms of loading times in games, but there are several things to keep in mind. For one, the difference will be more significant on a PS4 Pro, the architecture of which is better able to take advantage of the boost in performance. There's also the matter of costs: While SSDs are becoming more reasonably priced, there's still a pretty significant gulf in cost between SSDs and traditional HDDs.