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the fact of SDRAM, DDR1 and DDR2:

How to differentiate them, (physically);

CHip characteristics:

DDR1:

  • DDR-200: DDR-SDRAM memory chips specified to operate at 100 MHz
  • DDR-266: DDR-SDRAM memory chips specified to operate at 133 MHz
  • DDR-333: DDR-SDRAM memory chips specified to operate at 166 MHz
  • DDR-400: DDR-SDRAM memory chips specified to operate at 200 MHz

DDR2:

  • DDR2-400 100 MHz 200 MHz 400 Million
  • DDR2-533 133 MHz 266 MHz 533 Million
  • DDR2-667 166 MHz 333 MHz 667 Million
  • DDR2-800 200 MHz 400 MHz 800 Million
  • DDR2-1066 (planned) 266 MHz 533 MHz 1066 Million

Stick/module specifications:

DDR1

  • PC-1600: DDR-SDRAM memory module specified to operate at 100 MHz using DDR-200 chips, 1.600 GB/s bandwidth
  • PC-2100: DDR-SDRAM memory module specified to operate at 133 MHz using DDR-266 chips, 2.133 GB/s bandwidth
  • PC-2700: DDR-SDRAM memory module specified to operate at 166 MHz using DDR-333 chips, 2.667 GB/s bandwidth
  • PC-3200: DDR-SDRAM memory module specified to operate at 200 MHz using DDR-400 chips, 3.200 GB/s bandwidth

DDR2:

  • PC2-3200 200 MHz DDR2-400 3.200 GB/s
  • PC2-4200 266 MHz DDR2-533 4.264 GB/s
  • PC2-5300 333 MHz DDR2-667 5.336 GB/s1
  • PC2-6400 400 MHz DDR2-800 6.400 GB/s
  • PC2-8500 (planned) 533 MHz DDR2-1066 8.500 GB/s

Nothces:

DDR SDRAM DIMMs have 184 pins(as opposed to 168 pins on SDR SDRAM, or, 240 pins on DDR-2), and can be differentiated from SDRAM DIMMs by the number of notches;

  • DDR SDRAM has one.
  • SDR SDRAM has two(SDRAM).

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