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 Archives | Page 3 of 10 | Tech ARP
Intel Xeon D-1587 benchmarks - 16 core Xeon D is here
PassMark - CPU Benchmarks - List of Benchmarked CPUs