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If you are sensible and dont over do it, then they last just as long as stock.
4.6Ghz is nothing and thats almost average.
Id have to disagree with that, 4.6 is def not average, unless you work with nasa cpu's. No modern market cpu has exceded 5ghz and 4.6 is extremely fast, it is a new generation cpu utilising 4 cores. My cpu lick flightsim with tonnes of add-ons with full settings, there isnt a game around that can test a cpu like FSX. And the sandy bidges cope just fine.
Id have to disagree with that, 4.6 is def not average, unless you work with nasa cpu's. No modern market cpu has exceded 5ghz and 4.6 is extremely fast, it is a new generation cpu utilising 4 cores. My cpu lick flightsim with tonnes of add-ons with full settings, there isnt a game around that can test a cpu like FSX. And the sandy bidges cope just fine.
some say it will reduce to 5 years or so... but if u are a enthusiast, you will probably get a new pc by then