The Secret Of The Multiplier

12:26 - Wednesday 10 May 2006 by Bert Töpelt
Source: Tom's Hardware – Keywords: dual, 41, ghz, cores, uk

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

The Secret Of The Multiplier

Ad

The multiplier expresses the ratio between the processor clock speed and the FSB clock. For the Pentium D 805, the combination of FSB and processor clocks results in a multiplier value of 20x. By comparison with other CPUs with 200 MHz or 266 MHz FSB, this is a very high value - 12x and 14x are much more common. But this also makes the Pentium D 805 a good candidate for overclocking. Simply by raising the FSB clock rate to 200 MHz, the resulting CPU clock rate rises to 4.0 GHz once the 20x multiplier is applied (20x times 200 MHz equals 4.0 GHz).

You can peruse a list of all currently used multiplier values in our Intel Desktop Processor Overview chart.

An overview of all Intel CPUs back to the Socket 5 era (1993).

By default, the top-of-the-line Extreme Edition 965 uses a multiplier of 14x.

The multiplier for the Extreme Edition 965 can be set in the BIOS anywhere from 12x to 60x, but such capability comes at a high price. This CPU costs around £720, which few users can afford to spend just on one component. This is yet another reason why those who buy a high-end CPU should also consider investing the time and effort involved in overclocking.

The 20x multiplier is burned into the CPU and may not be altered using a special BIOS, nor with a hardware jumper on the motherboard.

Since the D 805's multiplier is fixed, there's only one way to overclock it: by increasing the clock speed for the front side bus.


Talkback
Be the first to comment on this review!

Note You are going to post a comment as anonymous.



  •
Submit my comment
Google Ads