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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 207.67+2.2%Jan 12 3:59 PM EST
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To: andreas_wonisch who wrote (50822)8/12/2001 1:56:58 PM
From: wanna_bmwRead Replies (2) of 275872
 
Andreas, I don't know if this will help, but here is AMD's blurb in their data sheet.

Thermal design power represents the maximum sustained power dissipated while executing publicly-available software or instruction sequences under normal system operation at nominal VCC_CORE. Thermal solutions must monitor the temperature of the processor to prevent the processor from exceeding its maximum die temperature.

Likewise, here is what Intel says in their Pentium III-M datasheet.

TDP is defined as the worst case power dissipated by the processor while executing publicly available software under normal operating conditions at nominal voltages that meet the load line specifications. The TDPnumber shown is a specification based on Icc(maximum) and indirectly tested by Icc(maximum) testing. TDP definition is synonymous with the Thermal Design Power (typical) specification referred to in previous Intel datasheets. The Intel TDP specification is a recommended design point and is not representative of the absolute maximum power the processor may dissipate under worst case conditions.

Finally, here is what is said for the Mobile Pentium III.

1. TDPTYP (Thermal Design Power) is a recommendation based on the power dissipation of the processor while executing publicly available software under normal operating conditions at nominal voltages. Not 100% tested.
2. TDPMAX is a specification of the total power dissipation of the processor while executing a worst-case instruction mix under normal operating conditions at nominal voltages. It includes the power dissipated by all of the components within the processor. Not 100% tested. Specified by design/characterization.

If I may speak frankly, I think that Pentium III-M and Athlon 4 are using the same TDPtyp result as the Mobile Pentium III. TDPmax probably does not give the manufacturer any extra information about how to design a system, so Intel and AMD have taken it out. From a design standpoint, it's the typical power dissipation that is important to design around.

wanna_bmw
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