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 W-2135 vs Intel Xeon E5-2690 Benchmarks, Specs, Performance Comparison and Differences - GadgetVersus
Intel Xeon E5-2690 review | 56 facts and highlights
CPU Benchmarks - Intel Haswell-EP Xeon 12 Core Review: E5-2650L V3 and E5- 2690 V3
CPU Benchmarks - Intel Haswell-EP Xeon 12 Core Review: E5-2650L V3 and E5- 2690 V3