Try the new Intel Desktop Utilities
Also check the CPU temperature in the BIOS, from Advanced >> Hardware Monitoring.
Check the Thermal Specification for the CPU if it is still within the range of operation.
Get your CPU sl number and search in the link below.
Website: http://processorfinder.intel.com/default.aspx or http://ark.intel.com
If it is much over the range then, check the following:
Make sure that you have a PSU Atx Version 2.2 at least.
Make sure that the chassis is TAC - Thermally Advantage Chassis
Check for proper aeration in the chassis. (cable)
Re-integrate the cpu with new small amount of thermal paste (clean the cpu before)
Hope this helps a bit.