High Quality Content by WIKIPEDIA articles! a thermally advantaged chassis is a computer enclosure that is capable of maintaining an internal ambient temperature below 38 degrees Celsius when functioning with Intel`s Pentium 4 and Celeron D processors based on 90 nm process technology, and an ambient temperature below 39 degrees Celsius when using a Pentium D processor. Intel maintains that using a thermally advantaged chassis is the absolute minimum requirement for using Pentium 4 (Prescott), Pentium D, and Celeron D, processors.