Lifespan of CPU is hard to predict, also overclocking doesn't mean it will reduce its lifespan, there is other things to the equation other than temperature, like voltage. Putting crazy voltage, even with L2N cooling or liquid helium, will reduce the lifespan of the CPU from few years to a few days. Just look at all those 'suicide runs' to achieve highest possible frequencies of the CPU with crazy voltages, they CPU won't even run after few days

5fps is a BIG increase if you mean minimum framerate. Some game that are CPU bound will benefits greatly from this gain, the difference between 20 and 25fps minimum framerate is huge in heated battle when you gaming

Overclocking is not for enthusiasts, its for cheapskate person like me who likes to have higher performance for fraction of a price. I buy Phenom 955BE instead of 965BE for RM100 less, and upping the multiplier to 17 from 16, to 965BE 3.4GHz. Effectively I get 965BE for RM100 less

When overclocking, look out for golden CPU, or GPU. I get lucky previously, from old Pentium 4 2.0GHz Northwood with C1 stepping that could be overclocked to 3GHz with stock cooling, also a paltry Sempron 2500+ 1.4GHz s754 overclcoked to 2.5GHz without a single milivolt of voltage increase also with stock cooling and 6800LE, that could be fully unlocked to 16 pipeline and get near 6800Ultra speed. Surprisingly, all the CPU I mentioned above still worked and kicking till today, except the graphics card which died because of lightning strike

Conclusion is, lifespan of PC components is just like human lifespan, you won't know when it going to die. Benefits? You get more for what you pay for, but you gotta know how a PC works before delving in overclocking waters. This is no place for spoonfeeding, you could find 10000001 guide for overclocking when you online. Goldfries don't like this kind of thread where we spoonfeeding newbies