Alot of the time the ps5 falls below 1080p is due to it struggling with rt, even lumen which is generally pretty forgiving compared to other rt solutions is a heavy performance cost on the ps5 due to rdna2 being terrible at it and rt has a cpu cost aswell which can be shores up by zen6. Bring in an architecture designed around rt and micropolygon tech and maybe even pathtracing and it will run rt workloads much faster....if the PS5 is below 1080p it's not the CPU that's the issue.