From Digital Foundry:
30fps? Try 40fps! Ratchet and Clank has beefed up its fidelity mode when you switch your PS5 to 120Hz output. Instead of updating every 33.3ms (30fps) on a 60Hz screen, Ratchet updates every 25ms (40fps) at 120Hz, the same consistency but smoother. In fact, it's like a midway point between 30fps and 60fps - and you keep all of the graphical advantages of the full-fat fidelity mode. The implications here are fascinating, as John and Rich discuss.