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Memory Speed: Socket AM2 Vs. Socket 939

AM2: AMD Reinvents Itself
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AMD decided in favor of the integrated memory interface in the CPU to ensure it can work at full processor speed, and attain a far higher bandwidth than is possible with a Northbridge interface connected via a slow bus. That was the theory anyway. This worked like a dream with Socket 939 and DDR memory; at a CPU clock speed of between 2 GHz (Athlon 64 X2 3200+) and 2.8 GHz (Athlon 64 FX-57), read and write speeds from memory hardly fluctuated at all.

To analyze bandwidth synthetically, we used Version 2.80.575 Beta of the Everest diagnostics program. The values returned by the program are very stable, even after several runs, and are not distorted by dual-core CPUs and hyperthreading.

Read Performance

The read speed of DDR2 compared to original DDR1 memory. DDR2 memory only drops off at high clock speeds, if at all.

With the DDR2 memory interface, the reality no longer matches the theory: data transfer rates fluctuate between 6.4 and 8.1 GB/sec when reading, at the same CPU clock speeds as the foregoing DDR1 comparison. The variance is almost 21%.

Only at clock speeds of 2.6 GHz and above does memory interface performance improve. That's because of the poor CAS latency (CL4.0) of DDR2 memory with a high data throughput, compared to DDR1 (CL2.0). Here the Athlon 64 X2 5000+ (2.6 GHz) achieves a value of 7.6 GB/sec, with the Athlon 64 FX-62 at 2.8 GHz scoring a top throughput of 8.1 GB/sec.

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