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Quoted from Jörge

they can’t tell,.

http://www.intel.com/support/processors/sb/CS-031479.htm

Quoted from

Intel’s limited warranty does NOT cover damage to the product due to external causes, including accident, problems with electrical power, abnormal electrical, mechanical or environmental conditions, usage not in accordance with product instructions, misuse, neglect, alteration, repair, improper installation, or improper testing.

If they look at the actual chip and see its been destroyed bc its showing obvious signs of damage from overclocking, they can easily deny you. You’ll prob get away with it though.