See below.  In older systems, processor boost could be manually controlled.  In your system, like all newer systems, it is automatic.

http://www.intel.com/support/processors/sb/cs-029908.htm

You can use the Intel turbo boost software to monitor the boost, though.

then why i installed gpu-z and when i ran a game the gpu clock speed didnt changed and stayed on 625 mhz when wrote it can reach 725-775 on turbo ?