The amount of heat a CPU generates depends on how hard it is working. On a desktop large heatsinks can be used to handle sustained periods of maximum CPU usage without an excessive heat build-up. On notebooks where less space is a available compromises are often made on the heatsink on the basis that such machines do not use the CPU at its maximum for sustained periods. This is particularily the case on the lower-price notebooks/netbooks as providing more sophisticated heatsink solutions is expensive.
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