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Encyclopedia > Thermal Design Power

The Thermal Design Power (TDP) represents the maximum amount of power the thermal solution in a computer system is required to dissipate. For example, a laptop's CPU cooling solution may be designed for a 20 W TDP, which means that it can dissipate (either via an active cooling method such as a fan, a passive cooling method via natural convection, via heat radiation or all three modes of heat transfer) the heat generated by 20 watts without exceeding the maximum junction temperature for the part. The TDP is typically set not to be the most power the chip could ever draw (such as by a power virus), but rather the maximum power that it would draw when running real applications. This ensures the system will be able to handle all applications without exceeding its thermal envelope, without requiring a cooling solution work for the max theoretical power, which would cost more and achieve no real benefit. A Toshiba Qosmio G20 desktop replacement laptop with a 17 inch screen. ... A wave that loses amplitude is said to dissipate. ... Convection is the transfer of heat by currents within a fluid. ... The watt (symbol: W) is the SI derived unit of power. ... A power virus is a malicious computer program that executes a specific instruction mix in order to establish the maximum power rating for a given CPU. CPU Burn-in applications are similiar programs which have the same effect as power viruses (high CPU usage) but are under the users...

TDP can be defined in different ways by different manufacturers. See the SilentPCReview article below.

External links

  • SilentPCReview article on TDP



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