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What's the Difference Between PC* and DDR* RAM Designations?

Discussion in 'Hardware' started by Anchoret, Jul 10, 2006.

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  1. Anchoret

    Anchoret Thread Starter

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    For example, isn't PC2700 the same thing as DDR333?

    Why are there two naming systems?

    Thanks for any clarification on this. I've always been confused about it.
     
  2. Rumpo-Stiltskin

    Rumpo-Stiltskin

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  3. Anchoret

    Anchoret Thread Starter

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    Ah!

    So...let me see if I understand this:

    DDR333 is the designation for the individual chip and PC2700 is the designation for the complete memory module made up of DDR333 chips, right?
     
  4. raybro

    raybro

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    Hi Rumpo-Stiltskin Check this out. I haven't run across anything that wikipedia doesn't address pretty thoroughly.

    Raybro

    EDIT... Boy did I mess that up. Not only did I address to to the wrong guy, but the guy I addressed it to had already made the same recommendation. Oh well, my bad.

    Raybro
     
  5. Anchoret

    Anchoret Thread Starter

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    Uh, well...anyhow...is my short-form explanation above correct? :confused:
     
  6. Rumpo-Stiltskin

    Rumpo-Stiltskin

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    Nope...... very wrong indeed. :D

    The "PC" rating addresses bandwidth whereas the 333 for example is bus frequency.
    Did you read them?
     
  7. Anchoret

    Anchoret Thread Starter

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    Yes, twice, and as best I understand them (before my eyes glazed over in incomprehension), for practical purposes PC* (for whatever technical spec it is) refers to the spec of the module and DDR* to the spec of the individual chip:

     
  8. Triple6

    Triple6 Moderator

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    If you want the simple answer then they mean exactly the same thing.
     
  9. Anchoret

    Anchoret Thread Starter

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    Yes, that's what I meant to determine. While they are not the identical standards, PC* is a module spec and DDR* is a chip spec.

    When momboard docs say it uses DDR333 memory, that's actually a misnomer, as it should properly say it uses PC2700 memory, as the end user doesn't typically build his own modules.

    Right?

    And so all this newbie confusion about whether to buy DDR333 or PC2700 is caused by some uninformed technical writer's poor grasp of JEDEC standards, and that DDR333 chips are always what's going to be in a PC2700 chip...right?

    I'm just trying to get the paint out of the bucket and onto the wall here, folks.
     
  10. Rumpo-Stiltskin

    Rumpo-Stiltskin

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    Well, the terms DDR333 and PC2700 are effectively inseparable if that's what you mean.
    So in relation to naming, yes they are the same. :)
     
  11. Triple6

    Triple6 Moderator

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    There are lots of terms that are mis-used in every industry, its just a fact of life. Many times professionals make up their own terms and then they get widely used.

    Where DDR400 would be used instead of PC3200 is where the modules are used not as system memory, like video cards.
     
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