Performance Comparison: E5-2690 vs E5-2687W | Puget Systems
PassMark - CPU Benchmarks - List of Benchmarked CPUs
Gaming Benchmarks - Intel Xeon E5-2687W v3 and E5-2650 v3 Review: Haswell-EP with 10 Cores
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. :
Performance Comparison: E5-2690 vs E5-2687W | Puget Systems