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 V6 Linux Benchmarks and Review
Intel Xeon E3-1220 V6 Linux Benchmarks and Review
Benchmark of Tensorflow using CPU and 3 different GPUs | by Ashar A. | Medium
Building An Intel Xeon E3 v5 "Skylake" Linux System - Phoronix
Intel Xeon E3-1220 Sandy Bridge Benchmarks and Review
Intel Xeon E3-1220 v5 | Processor benchmarks | PC Builds