How useful are low power server CPUs? - Low Power Server CPUs: the energy saving choice?
Intel Xeon X5670 @ 4560.05 MHz - CPU-Z VALIDATOR
Tech ARP - CPU Performance Comparison Guide Rev. 6.6
Intel Xeon X5670 - AT80614005130AA / BX80614X5670
SPECpower_ssj2008
Intel Xeon X5670... - Leon Computers Premium Workshop | Facebook
Overclocking a Xeon x5670 CPU to 4GHz - YouTube
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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. :
OC X58 Xeon x5670 - wall at 3.91 - CPUs, Motherboards, and Memory - Linus Tech Tips