Benchmarks comparing the PS4 Jaguar CPU to the PS5 Zen CPU show what a massive upgrade the PS5 is for devs, they had regularly expressed frustration at last gen's weak CPU capability
PS4 vs. PS5: Everything You Need to Know | Digital Trends
PS4 Official Specs from Sony : r/Games
PS4 has 8GB of RAM, almost 2 teraflops of computational performance | VG247
PS4 Pro could end up faster than XBox One X, through the RPM feature found in AMD GPUs - NotebookCheck.net News