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The CPU Articles
Topics:

DDR2 SLI Memory: 10.3 GB Per Second

7:54 PM - May 23, 2006 by Bert Töpelt
Source: Tom's Hardware US – Keywords: amd, reinvents
Topics: AMD/ATI

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Table of Contents:
10 – DDR2 SLI Memory: 10.3 GB Per S...
  1. 1 – The AMD Generation Comes Of Age
  2. 2 – New Socket AM2 With DDR2
  3. 3 – Memory Speed: Socket AM2 Vs. Socket 939
  4. 4 – Write Performance
  5. 5 – Write Performance, Continued
  6. 6 – Write Performance, Continued
  7. 7 – Memory Speed: AMD Vs. Intel
  8. 8 – Memory Speed: AMD Vs. Intel, Continued
  9. 9 – The Divider Problem
  10. 10 – DDR2 SLI Memory: 10.3 GB Per Second
  11. 11 – Automatically Overclocking SLI Memory
  12. 12 – Automatically Overclocking SLI Memory, Continued
  13. 13 – All New AM2 Processors
  14. 14 – The New Socket AM2 With 940 Pins
  15. 15 – New Retention Module Requires New Heatsink
  16. 16 – Low Dissipation Guaranteed
  17. 17 – New Energy-efficient Processors
  18. 18 – Heatsinks: Things Gets Louder, Continued
  19. 19 – Features: Virtualization And TCPA
  20. 20 – Price Comparison: AMD More Expensive Than Intel
  21. 21 – Motherboards
  22. 22 – Gigabyte
  23. 23 – Epox
  24. 24 – The New nForce5 Chipset For AM2
  25. 25 – LAN Interface With 2 Gbit/s
  26. 26 – Test Setup
  27. 27 – Benchmarks And Settings
  28. 28 – Benchmarks Socket 939 Vs. Socket AM2
  29. 29 – Games - DirectX
  30. 30 – Games - DirectX, Continued
  31. 31 – Video
  32. 32 – Video, Continued
  33. 33 – Video, Continued
  34. 34 – Video, Continued
  35. 35 – Audio
  36. 36 – Applications
  37. 37 – Applications, Continued
  38. 38 – Applications, Continued
  39. 39 – Multitasking, Continued
  40. 40 – Synthetic Benchmarks
  41. 41 – Synthetic Benchmarks, Continued
  42. 42 – Synthetic Benchmarks, Continued
  43. 43 – Synthetic Benchmarks, Continued
  44. 44 – Synthetic Benchmarks, Continued
  45. 45 – Evaluating The Benchmark Scores
  46. 46 – Athlon 64 X2: Now Somewhat Slower
  47. 47 – Benchmarks AMD Vs. Intel
  48. 48 – Games - DirectX
  49. 49 – Games - DirectX, Continued
  50. 50 – Video, Continued
  51. 51 – Audio
  52. 52 – Applications
  53. 53 – Applications, Continued
  54. 54 – Multitasking
  55. 55 – Synthetic Benchmarks
  56. 56 – Synthetic Benchmarks, Continued
  57. 57 – Synthetic Benchmarks, Continued
  58. 58 – Synthetic Benchmarks, Continued
  59. 59 – Synthetic Benchmarks, Continued
  60. 60 – Synthetic Benchmarks, Continued
  61. 61 – AMD Athlon 64 FX-62 Vs. Intel Extreme Edition 965
  62. 62 – Conclusion: Good Energy Efficiency, But A Bad Value For Money

DDR2 SLI Memory: 10.3 GB Per Second

The AM2 CPUs are designed to take a maximum memory clock of DDR2 800. This is not the most attractive prospect for overclockers, of course, since there are already memory modules out there running at up to DDR2 1066. The name promises great things, but the idea is actually quite simple.

Stores will be carrying these special memory modules, which are simply called "SLI memory." Nvidia has partnered with memory manufacturer Corsair to bring these to market. The technology is an open standard, so other manufacturers can also offer these SLI modules. Corsair has announced that in the future all XMS2 modules will have the SLI function.

Corsair's SLI memory is still a pre-test sample and has the name printed on it.
How Does SLI Memory Work?

In the memory module, several overclocking profiles are stored, which can be selected via the BIOS.

SLI memory settings in BIOS: With some BIOS versions, this is only visible when SLI memory is being used.

In the memory modules' serial presence detect (SPD) EEPROM, which stores information about the module along with its speed and timings, additional data is entered, resulting in these profiles.

SPD data is stored in this little EEPROM - with SLI memory, additional data is also included.

The corresponding standard is called Enhanced Performance Profiles (EPP). There's only room for two of these profiles in the EEPROM, since it has very little storage space. Two complete sets of data can be stored, but it is also possible to burn up to four reduced versions (with less data) onto the EEPROM. The following table shows you the information that can be stored.

EPP Memory Information in EEPROM
Available Data Complete Version Reduced Version
Voltage Level X X
Address Cmd Rate X X
Chip Select Drive Strength X  
Clock Drive Strength X  
Data Drive Strength X  
DQS Drive Strength X  
Address/Command Fine Delay X  
Address/Command Setup Time X  
Chip Select Delay X  
Chip Select Setup Time X  
Minimum Cycle at Sup. CAS Latency X X
CAS Latency X X
Minimum RAS to CAS delay (tRCD) X X
Minimum Row Precharge Time (tRP) X X
Minimum Active to Precharge Time (tRAS) X X
Write Recovery Time (tWR) X  
Minimum Active to Active/Refresh Time (tRC) X  

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