Hi Sunny,
The CPU speed detected at the VM level is what the host actually sees. So even if you have turbo boost enabled, the guest OS is turbo boost agnostic. The only way you can achieve this is by overclocking the host CPU temporarily to above 2 Ghz so that the guest sees the same.
Processors — Intel� Turbo Boost Technology Monitor overview
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Intel® Turbo Boost Technology is a processor technology and is operating system agnostic. See more on Intel Turbo Boost Technology.
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Regards
a