It might be the CPU? Toms Hardware disabled half the cores of their Core i9 9900K,essentially making it a Core i7 7700K and performance dropped noticeably. HUB said their Ryzen 5 3600 was at 80% utilisation,so it wouldn't surprise me one bit the game might work somewhat better with at least 8 cores?? So if someone is using a highly overclocked 8~16 core CPU it might be helping out?? Hopefully some reviewers will test this out soon!!
It's not the CPU. Guru3d's bench setup used a Ryzen 9 5950X on a X570 (ASUS Crosshair VIII HERO). Tom's Hardware got 54.8fps average with DLSS performance. Guru3d got 42fps average with DLSS quality - about an expected difference and similar to my own system with a Ryzen 3600. My 3600 is also about 60-70% utilisation, but my RTX 3090 FE is at 100% utilisation. At these settings on 4K, GPU is the bottleneck and not CPU.