Thermal Interface Material (TIM) and Phase Change Material (PCM)

J. Each solution has its advantages and disadvantages. Greases are often more thermally conductive, but tend to be more difficult to work with and create more mess. Many greases are also electrically conductive or capacitive and can short out the processor if it comes in contact with any surface mounted components on the processor package. PCM is usually pre-installed but is only good for one time use. Once the heatsink is removed after the processor has been powered on, the material needs to be replaced. Since PCM is usually pre-installed on the heatsink there is no need to worry about using the proper amount. If a replacement PCM pad is required, it will usually come in a 1x1 inch square pad. However, the old pad should be completely removed from the heatsink before applying the new one.

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