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. :
Kereskedelmi Véletlen egybeesés hívás xeon x5670 benchmark csattanás gyémánt kristály
The Intel Xeon 5670: Six Improved Cores
Intel Xeon X5670 Dual 6 Core Processor Benchmarks and Review