Ive had this problem countless times with customers and friends.
Most people with heat problems are using a AMD chip but in your case our using a top notch pentium proccesor.
Make sure that your heatsink has heat tranparency jell on the bottom of it, next check that your fan isnt running on the slow side.
If all checks well make sure you have enough case fans(2 or more),if you dont this can lead to extreme heat build up and take a toll on all of your hardware. If you dont have 2 or more fans dont go through all the trouble buying a new case re-installing the hardware etc. Heres what you do if you dont have 2 or more case fans--- Go to www.xoxide.com
and there should be a side category on your left hand side, then one of them should say "case fans" click on that then it should say a bunch of diffrent fans,scroll down, and click on "miscilaneous fans" now it will show a range of pci port fans---what these fans do is instead of just blowing on things they suck all the hot air out of your case/computer and blow it out the back. Theese fans are inexpensive ($7-$12) and work very well. E-mail me and let me now how it goes at email@example.com