Intel Stakes Its Vision of the PC Future with 775 Launch

New Memory: DDR2-533, Continued

Basically DDR2 memory works similarly to DDR1 and operates with two data transfers per clock cycle (double data rate mode). However, DDR2 has been designed to reach much higher clock speeds. New features make an appearance here: On-die termination takes care of signal reflection, and reduced page sizes lower the energy required for activating pages. Posted CAS makes it possible to carry out a CAS command directly after the RAS signal without any collisions. This simplifies the design of the controller and increases the theoretical load that the memory can handle. At eight cycle bursts, the specification provides for a new burst type called Sequential Nibble, which divides the burst into two 4 bit Nibbles. Also, this enables burst lengths of eight cycles in interleaving mode.

The package type that memory manufacturers prefer will either be FBGA (fine-line ball grid array) or tiny BGA. As there is nothing new to tell in terms of performance, the following table should provide sufficient information.

Memory Type Clock Speed Name Bandwidth
DDR266 133 MHz DDR PC2100 2,100 MB/s 4,200 MB/s
DDR333 166 MHz DDR PC2700 2,700 MB/s 5,400 MB/s
DDR400 200 MHz DDR PC3200 3,200 MB/s 6,400 MB/s
DDR2-400 200 MHz DDR PC2 3200 3,200 MB/s 6,400 MB/s
DDR2-533 266 MHz DDR PC2 4300 4,266 MB/s 8,533 MB/s
DDR2-667 333 MHz DDR PC2 5300 5,333 MB/s 10,666 MB/s
DDR2-800 400 MHz DDR PC2 6400 6,400 MB/s 12,800 MB/s

Source: Micron DesignLine Vol. 12, 3Q03
  1. Intel's 775 Launch Mixes Ambition With A Strong Aftertaste
  2. First Contact
  3. Obstacles And Hurdles
  4. More Findings
  5. New Socket: LGA 775
  6. LGA 775 Processor Installation
  7. LGA 775 Processor Installation, Continued
  8. LGA 775 Processor Installation, Continued
  9. MSI's CPU Installation Tool
  10. Transitional Products
  11. Poor Thing: Intel Reference Cooler
  12. New Processors: P4 Prescott Up To 3.6 GHz
  13. Specification Overview
  14. Model And Pricing Information
  15. Processor Overview
  16. New Chipsets: 925X, 915G, 915P, 915GV
  17. New Chipsets: 925X, 915G, 915P, 915GV, Continued
  18. 925X Express Chipset
  19. 915G Express Chipset
  20. 915G Express Chipset, Continued
  21. 915G Express Chipset, Continued
  22. 915P Express Chipset
  23. Chipset Devices
  24. Intel Puts The Lock On Overclocking
  25. How To Unlock The Overclocking Lock
  26. New Memory: DDR2-533, Continued
  27. DDR2 Memory Vendors
  28. Intel Flex Memory Technology
  29. New Interlink: PCI Express
  30. More SATA, More RAID, More Ports
  31. Matrix RAID
  32. Creating A RAID Array
  33. More HD Performance For Free: Command Queuing
  34. More Networking: Intel Wireless Connect Technology
  35. New Audio: High Definition Audio
  36. Asus P5AD2 Premium
  37. Foxconn 925A01
  38. Test Setup
  39. Benchmarks And Settings
  40. Platform Benchmarks
  41. DirectX 8 Benchmarks
  42. DirectX 8 Benchmarks, Continued
  43. DirectX 9 Benchmarks, Continued
  44. Video Benchmarks
  45. Video Benchmarks, Continued
  46. Application Benchmarks
  47. Application Benchmarks, Continued
  48. Synthetic Benchmarks
  49. Synthetic Benchmarks, Continued
  50. Processor Power Consumption
  51. Integrated Graphics Benchmarks
  52. Game Benchmarks
  53. Halo
  54. Far Cry
  55. Video Performance
  56. Networking Benchmarks
  57. Storage Subsystem Benchmarks
  58. Conclusion
  59. A Final Note
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  • So how do you unlock it?