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. :
Benchmarking Performance: CPU Encoding Tests - The Intel Xeon W Review: W-2195, W-2155, W-2123, W-2104 and W-2102 Tested
Intel Xeon E3-1220 Sandy Bridge Benchmarks and Review
Intel Xeon E3-1220 Sandy Bridge Benchmarks and Review
INTEL XEON E3 1220 v3 - CAN YOU PLAY ON IT? - YouTube