Linux Performance - 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. :
Dual Intel Xeon E5-2690 Linux Benchmarks - Fast
Intel Xeon E5-2690 review | 56 facts and highlights