My experiences of overclocking have always been positive. My last CPU the E8500 was bought in 2008 and ran at 4Ghz plus since new and has never missed a beat. A few weeks ago that CPU was placed in my HTPC at stock speed and continues to run fine. As long as you have the knowledge and understanding of how to accomplish that then the longevity should not be compromised. My new CPU the 3570k has been overclocked since new at 4.4Ghz. It runs at its hottest (75c) well below the TJ Max set by Intel (105c), the voltage has been offset to 0.06v which is again well below Intel's max voltage for the chip. I use the turbo function still and thus the chip scales from 1600mhz to 4400mhz as needed. The warranty is not compromised and the longevity will be fine - only excessive heat (although with excessive heat the chip would simply throttle down) and voltage extremes could compromise that. The performance differences from doing the above is enough to justify the "no risk" approach that I take and thus reap the benefits. I have noted significant increases in both Civ V and Shogun II by overclocking the CPU.