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. :
CPU Benchmarks - Intel Haswell-EP Xeon 12 Core Review: E5-2650L V3 and E5-2690 V3
Intel Xeon Gold 6148 Benchmarks and Review The Go-To HPC Chip
Overclocking Xeon 2690(v2) | TechPowerUp Forums
Intel Xeon E5-2690 v3 | Processor Benchmarks | PC Builds