Intel Pentium 4 2.2 GHz and AthlonXP 2000+ in the test: The battle of the titans
- 1 Foreword
- 2 Overview
- 3 Technology
- Power consumption
- 7 Requirement
- 8 Known errors
- Test system
- 24 Conclusion
The temperature sensors of the Pentium 4 are another very pleasant feature for the user 4 offers two completely independent temperature sensors that can trigger two different protective mechanisms.
The first protective mechanism of the Pentium 4 is the so-called 'Thermal Monitor'. It is made up of oneTemperature sensor directly in the CPU core, a signal (PROCHOT #), which indicates when the processor has reached its maximum temperature, and a control mechanism (Thermal Control Circuit TCC), which influence the CPU temperature by regulating the CPU clocks can. As soon as the CPU has reached a set fixed temperature, the PROCHOT # signal is activated, the TCC kicks in and skips a few clocks in the CPU. Usually about every other measure is skipped. Of course, it should be noted that this has a direct impact on performance. If every second cycle is skipped, the performance is also reduced. Much more important, however, is that the CPU temperature also drops significantly in the process and the processor is thus protected from damage. If the temperature falls below the fixed value again, the PROCHOT # signal is interrupted and the processor works again at full power.
The second temperature sensor is only intended for an absolute emergency if the cooling fails and skipping several cycles is unsuccessful. As soon as the silicon reaches a temperature of around 135 ° C, the Pentium 4 reacts with the THERMTRIP # system bus signal and switches itself off completely. Since THERMTRIP # works completely independently of the processor, it does not generate any clocks. The signal remains active until the processor has been disconnected from the power source and a complete reset has been carried out.
And here one has to give Intel a big compliment. The protective mechanisms of the Pentium 4 work perfectly and the processor continues to run for many hours, even if it is passively cooled, albeit with reduced performance. Horror videos like those that appeared at the launch of the Athlon XP and in which oneA smoking CPU, because the protective mechanisms did not work, are a thing of the past with the Pentium 4, if both temperature sensors do not fail, which should never happen under normal circumstances.
The table clearly shows that the consumption of the Pentium 4 with Northwood core is well below that of an Athlon. You can also see the savings in consumption by switching to 0.13 µm production technology. At the same speed, the Pentium 4 with 2 GHz and Northwood core consumes 23 watts less than its predecessor with Willamette core and 0.18 µm technology.
At this point we want to briefly refer to the ones we determined Temperatures of the various processors. The following table shows the temperatures during normal Windows operation and after a game of Quake 3 Arena:
As long as the CPU runs stable and no crashes due to overheatingthe user can actually be pretty indifferent to whether the processor is now 28 ° C or 50 ° C warm. However, the technological progress of the Pentium 4 becomes clear here, which is already manufactured in 0.13 µm and therefore produces significantly less waste heat. At AMD, the conversion of the manufacturing process is currently in full swing and you can expect the first Athlon XPs manufactured in 0.13 µm soon.
On the next page: Requirements