I just found this..It may be of some interest to a few :
Charts and more below :http://www.intel.com/cd/channel/rese.../eng/53211.htm
IntelÂ® PentiumÂ® D processor is the first desktop PC processor manufactured with two CPU cores within a single processor. It offers a way of delivering more capabilities while balancing power requirements. To meet PentiumÂ® D processor's thermal specification, Intel recommends that you use a chassis that can maintains an internal ambient temperature below 39oC. Intel also recommends that you use a chassis that can maintain an internal ambient temperature below 38oC when using IntelÂ® Coreâ„¢2 Duo Processor ,IntelÂ® PentiumÂ® 4 processor and IntelÂ® CeleronÂ® D processor based on 90nm process technology.
A properly cooled system can help the processor run more reliably and minimize the acoustic noise levels generated from running the cooling fan at higher speeds. Intel thermal specifications recommend the use of a Thermally Advantaged Chassis (TAC) version 1.1 for IntelÂ® Coreâ„¢2 Duo Processor PentiumÂ® D processor , PentiumÂ® 4 processor based systems. Intel also recommends the use of a Thermally Advantaged Chassis (TAC) version 1.0 for CeleronÂ® D processor based systems.
This chassis list has been provided to Intel dealers as an aid in the system integration process. Intel has determined these chassis meet MINIMUM thermal, mechanical fit and functional compatibility to properly support the IntelÂ® Coreâ„¢2 Duo Processor,IntelÂ® PentiumÂ® D processor, IntelÂ® PentiumÂ® 4 processor, and IntelÂ® CeleronÂ® D processor based on 90nm process technology. However power supplies have not been validated to meet the electrical requirement of the processor or the system. These chassis were tested in a thermal chamber set to 35Â°C with the following peripherals installed: