Hello David Lopes,
We have downloaded and ran the Intel® Turbo Boost Technology Monitor and no errors were found.
We recommend you contacting Dell* for information on Intel® Turbo Boost Technology support on your system as well as for troubleshooting.
From the processor side, we recommend you making sure it is being properly recognized; for this matter, feel free running the Intel® Processor Identification Utility: http://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=7838