CPU-Z Benchmarks on various Synology models - Hope this helps give a rough idea of the CPU power difference between models. Also included 2 other VMs running on Windows Hyper-V Server. :
Intel Xeon E3-1220 V3 Crafty Bench Linux - ServeTheHome
PassMark - CPU Benchmarks - List of Benchmarked CPUs
CPU Benchmark puts 3900x on top! : r/Amd
Intel Xeon E3-1270 V3 Benchmark and Review
Intel Xeon E3-1220 v3 | Processor Benchmarks | PC Builds