Technical Reference
63
Table 30 provides maximum case temperatures for the components that are sensitive to thermal
changes. The operating temperature, current load, or operating frequency could affect case
temperatures. Maximum case temperatures are important when considering proper airflow to cool
the board.
Table 30. Thermal Considerations for Components
Component
Maximum Case Temperature
Intel Pentium 4 processor
For processor case temperature, see processor datasheets and
processor specification updates
Intel
82945PL MCH
103
o
C (under bias)
Intel 82801G ICH7
110
o
C (under bias, without heatsink)
99
o
C (under bias, with heatsink)
For information about
Refer to
Intel Pentium 4 processor datasheets and specification updates
Section 1.2, page 15
2.12 Reliability
The Mean Time Between Failures (MTBF) prediction is calculated using component and
subassembly random failure rates. The calculation is based on the Bellcore Reliability Prediction
Procedure, TR-NWT-000332, Issue 4, September 1991. The MTBF prediction is used to estimate
repair rates and spare parts requirements.
The MTBF data is calculated from predicted data at 55 ºC. The MTBF for the D945PLNM board is
117,195.79 hours.
