Intel's Specs Say The Chassis Temperature Max. Is 38°
We found it interesting to read the package insert. According to this little piece of paper, the chassis temperature is not intended to exceed 38°C.
The message is clear. Your computer case's temperature on the inside should remain at below 38°C.
Pentium 4 PRB Categories
The dependence of the thermal loss and TCase (CPU temperature) results in the TDP number (Thermal Design Power).
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The PRB1 specification (Performance Requirement Bit enabled), valid for the P4 550 and the P4 560 in Socket 775, allows for a Thermal Design Power (TDP) of 115 W max.
Intel has two categories that differ in proportion to thermal loss.
