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Heat transfer compound or Heat sink compound is typically a white paste made from zinc oxide in a silicone base. Very little of the substance is needed, just enough to fill the gap between the CPU and heat sink. Using more will not make it work better, it will just make a big mess when you press the heat sink down onto the CPU, much like putting too much strawberry jam in your PB&J sandwich. :^) The use of this compound is strongly recommended for those who want to cool their processors properly. because heat is transferred typically the compound does dry out So to answer your question proper maintenance suggests reapplying at least once a year to prolong processor life.

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Q: Does the heatsink grease on computers have to be replaced from time to time?
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