Is the "overclocking" covered under warranty by manufacturer? In the article, it says:

"Overclocking the system will void your warranty." in their manuals. This may take care of the legal issues, but who reads these warnings anyway? "Dell does not recommend operating the CPU at a frequency that is greater than the manufacturer´s design specification. Operating the CPU in this manner may cause your system to shut down unexpectedly causing loss of data and may reduce the operational life of the processor. If the system shuts down unexpectedly or is unstable, please select a lower CPU operating frequency. Please refer to the tech sheet included with your system for additional information."

Finally, it says:

Though I can´t exactly say that overclocking has gone mainstream,

This reminds of some academic papers, of which the grade is assigned, just by reading the title.