Q: Do Prescott CPUs need special cooling fans?
Why does my system become quite unstable and PWM/SYSTEM temperature reaches 120℃ / 248℉ or even higher?(AI7 / IS7 / IS7-G / IS7-E / IC7-G / IC7-MAX3 / VT7)
A: According to Intel® Pentium® 4 Processor on 90 nm Process Thermal and Mechanical Design Guidelines page 18, figure 2, we strongly recommend that you should use Intel certified Multidirectional Airflow fan heatsink to ensure that the temperatures of all components in the system are maintained within their functional temperature range.

http://support.intel.com/design/Pentium4/guides/300564.htm