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This is assuming you haven't damaged the CPU, of course. Yes, the warranty should be restored if you've reversed your CPU or GPU overclock and all the settings are now back to their default values. Is the Warranty Restored If I Reverse the Overclock?
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However, there is absolutely no way for the vendor to know unless you willingly tell them you overclocked it. Technically, yes, it does void the warranty of your CPU and GPU since you're exceeding the processor's default specs. Furthermore, CPU and motherboard manufacturers often build with overclocking in mind, producing special hardware that suits overclocking. Processors and graphics cards are now much more capable of handling heat because cooling systems have improved over the years.
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Overclocking is not as dangerous as it once was.
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