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Risk-free Overclocking, Including Heat Protection

A 4.1 GHz Dual Core at $130 - Can it be True?
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The Pentium D supports version 2 of Intel's Thermal Monitor, a protective mechanism that enables the system to keep running and also prevents damage to the processor itself. Thermal Monitoring has been around since the Pentium 4 (Willamette) was introduced in 2000. If the CPU exceeds a specific temperature threshold, the clock controller for the processor automatically throttles back from time to time. This causes power consumption (and thus also heat output) to diminish quickly, though obviously performance will suffer noticeably.

The reworked Thermal Monitoring 2 is smarter, because the clock controller no longer skips clock cycles, but rather throttles back the processor clock rates. For this purpose, the controller likewise uses the PROCHOT signal, to allow the system to keep running smoothly, albeit at a reduced clock rate. Because the activation of PROCHOT as a protective mechanism through Thermal Monitoring 2 occurs right in the processor, neither BIOS updates nor settings changes are needed. The already described Enhanced Halt Mode C1E takes this one step further, and applies this when the idle process is running in the operating system.


Block diagrams of the workings of Thermal Monitoring 1 and 2.

Because Thermal Monitoring 2 provides a form of "overheating insurance", as it were; it's easier to overclock systems with this capability. Should the system overheat, it also reacts noticeably better than a system protected by Thermal Monitor 1. Thus, the second version of Thermal Monitor offers an additional bonus for overclockers to exploit.

Summary
  1. A Budget CPU At Top Speeds
  2. A Budget CPU At Top Speeds, Continued
  3. Inside the Pentium D 805
  4. The Secret Of The Multiplier
  5. 133 MHz FSB: Perfect For Overclocking
  6. How Is Breaking The 4 GHz Barrier Possible?
  7. How Is Breaking The 4 GHz Barrier Possible? Continued
  8. How Is Breaking The 4 GHz Barrier Possible? Continued
  9. Three Theories Where The Customer Comes Out Ahead
  10. Which Memory Clock Speed Is Most Suitable?
  11. The Right Chipset
  12. Keeping Cool When Power Consumed Tops 150 Watts at 4.1 GHz
  13. Keeping Cool When Power Consumed Tops 150 Watts at 4.1 GHz, Continued
  14. Power Consumption Levels Top 200 W
  15. Power Consumption Levels Top 200 W, Continued
  16. Energy Saving Functions Lack C1E
  17. Risk-free Overclocking, Including Heat Protection
  18. Ready For The 64 Bit Future
  19. Tom's Hardware Guides Overclocking Diary
  20. 3.33 GHz Remains Stable At Standard Voltage Levels
  21. 3.33 GHz Remains Stable At Standard Voltage Levels, Continued
  22. Trouble Free Operation At 3.60 GHz
  23. At 3.8 GHz Some Minor Voltage Increases Become Necessary
  24. Water Cooling Is Recommended For 4.0 GHz
  25. Water Cooling Is Recommended For 4.0 GHz, Continued
  26. Overclocking To 4.10 GHz Boosts Basic Clock Speed By 54 Percent
  27. Overclocking To 4.10 GHz Boosts Basic Clock Speed By 54 Percent, Continued
  28. Will The System Boot At 4.3 GHz?
  29. Benchmark Results Show Performance Increases Of Up To 54 Percent
  30. 3D, Continued
  31. 3D, Continued
  32. Video Editing / Video Encoding
  33. Video, Continued
  34. Video, Continued
  35. Audio Encoding
  36. Office Applications
  37. Office Applications, Continued
  38. Parallel Applications - Multitasking
  39. Synthetic Benchmarks
  40. Synthetic Benchmarks, Continued
  41. Synthetic Benchmarks, Continued
  42. Synthetic Benchmarks, Continued
  43. Summary Overview: Who's The Winner?
  44. Conclusion: The 4.1 GHz Dual Core Delivers Peak Performance For Pocket Change
  45. Conclusion, Continued
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