Hello FBDIMM, it is important to understand first that processor over clocking is a practice that overstresses the unit; hence it could be expected to have problems sooner or later. There is no processor capable to last the expected lifetime from factory if it is over clocked and Intel cannot guarantee the proper functionality of a CPU if it is being over clocked because every single unit is manufactured to run within specifications.
Even though the unlocked CPUs and the Intel® Extreme Edition Processors are more robust to handle over clocking, this practice will reduce the life time of the unit and will generate damages; that’s why the warranty doesn’t cover it.
We make unlocked and Extreme Edition Processors because there is a section of the computer market that likes doing that but they know this is a risk under their responsibility. Also there are OEM computer manufacturers that sell systems already over clocked from factory like Alienware and Northwest Falcon but they provide the warranty support if something goes wrong. We do provide recommendations for save over clocking but we provide as well a clear disclaimer about it. See the following web site and read the information at the bottom of the page:
Over clocking Intel® Processors:
From our side, this is all the information I could provide you, but you could wait for another user to reply to this thread with other recommendations.