Dual Intel Xeon E5-2697 V4 Benchmarks - #3 in the lineup
Intel Xeon E5-2699 V4 benchmarking the top end E5 V4 CPU
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. :
Dual Intel Xeon E5-2690 UnixBench Single Threaded - ServeTheHome