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I'm getting a few old computers to take apart for parts soon.

Most of them are definitely using DDR2 RAM, but there is the possibility that one or two of them are using DDR RAM. Since these are quite old, the manuals have since been lost.

Is it possible to tell DDR and DDR2 RAM apart visually, and if so how?

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From this site:

DDR memory modules have 184 pins and one notch: DDR

DDR2 modules have 240 pins and one notch. The notch on DDR2 DIMMs is in a different position than DDR DIMMs, and the pin density is slightly higher: DDR2

The site also contains specifications of the memory types...

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alt text

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DDR2 has more pins, and the notch is in a different place. In DDR, the notch should be close to the centre, wheras ddr2 is further off-centre. (But it's been a while since I've seen DDR ram, so I could be wrong!)

DDR2:

DDR2

DDR:

DDR

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  • Bet you get more comment-kudos if you find pictures.
    – Nathaniel
    Commented Dec 7, 2009 at 22:12
  • Better? :) (Did notice neither are really centered, though.
    – Phoshi
    Commented Dec 7, 2009 at 22:37

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