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. :
Best Intel Xeon Processors for SQL Server – Glenn's SQL Server Performance
Intel Xeon Silver 4108 Sysbench Multi Threaded CPU Benchmark - ServeTheHome
Intel Xeon E5-2699 V4 benchmarking the top end E5 V4 CPU