in reality a peltier will last you a good long time. . .since many manufacturers are going to try and keep their processors from running hotter than 52 degrees C then no matter how fast they get you shouldn't expect the temp to go above that. with that in mind you get a good pelt that can push a 52C CPU to around 0C then viola you have a setup that will last a good long time. same applies to water cooling and extreme air cooling. the main reason is actually heat stress, if the processor runs to hot then turning the computer on and off will cause the core/slug/inner circuitry to crack.
sooooo anyway, get something that's considered powerful nowadays and it should last awhile, best of luck,
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