Jayztwocents talks about the safety of overclocking a CPU and GPU/Video Card and I completely agree with the points he mentions here. My personal system is a 2700k at 4.8ghz for over 4 years now and still rock solid. Give Jay a follow on YouTube if you enjoy his content.
JayzTwoCents just released a great overview video of the benefits of overclocking and the different methods of doing so. XMP vs Auto vs Manual. When I overclock a system I prefer Manual, what do you prefer?