Answer
Yes, it is recommended. When you attempt to support Turbo Boost Technology with Intel® Turbo Boost supporting processors, it is suggested to enable C-State in BIOS to obtain better performance if it is available.
For example,
One particular processor may allow up to two frequency steps (266.66 MHz) when just one core is active and one frequency step (133.33 MHz) when two or more cores are active. Therefore, higher deep C-state residency ("C3" or "C6") on some cores will generally result in increased core frequency on the active cores.
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- Refer to Intel® Turbo Boost Technology
http://www.intel.com/technology/turboboost/index.htm?iid=tech_product+tb
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