I have replaced my amd phenom II X6, 12GB ram and 4 disk raid 10 and a crappy psu desktop, with a topton amd ryzen 5825U with 64 GB ram and 2 TB SSD.
I run proxmox with powertop optimized excluding the ethernet adapters.
This was really a big step forward in performance and because my workloads (nextcloud,homeassistant and vaultwarden) are mostly idle a lot of the time the processor cores can spend in sleep mode conserving power. To be honest i have not used an power measuring device, so my estimation is based on the powertop reported powerconsumption times 2. However in homeassistant the lowest power consumed in the night for my home dropped from 147 watts to about 85 watts.