Performance Comparison: E5-2690 vs E5-2687W | Puget Systems
CPU Benchmarks - Intel Haswell-EP Xeon 12 Core Review: E5-2650L V3 and E5- 2690 V3
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 E5-2699 V4 benchmarking the top end E5 V4 CPU