UDIMM vs SODIMM?

Discussion in 'Hardware Components and Aftermarket Upgrades' started by vaw, Apr 26, 2009.

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  1. vaw

    vaw Notebook Deity

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    What does UDIMM memory mean? How does it compare to SODIMM?
     
  2. Commander Wolf

    Commander Wolf can i haz broadwell?

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    Is that U actually a Mu and therefore a UDIMM actually a MicroDIMM? A MicroDIMM is basically laptop memory with a smaller form factor than the standard SODIMM. As far as I know, they're not compatible at all, and laptops using MicroDIMMS are few and far between.
     
  3. vaw

    vaw Notebook Deity

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    Wolf, thanks for responding. I just found this:

    "what is UDIMM - shorthand for Unbuffered DIMM (a DIMM without a register or buffer)"

    But what does that mean? I assume it's a minus to be "without a register or buffer"? Does it affect anything significantly?

    Edit: here are more details, but I just want an answer to my simple question above ;)
     
  4. Commander Wolf

    Commander Wolf can i haz broadwell?

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    http://en.wikipedia.org/wiki/Unbuffered_memory

    Buffered memory is indeed usually only used in servers and commercial applications. My laptop uses unbuffered memory, your laptop probably uses unbuffered memory; the standard memory you buy at Fry's or Newegg is unbuffered memory. The added reliability of buffered memory is really a case of adding more nines onto 99.99%.
     
  5. Ayle

    Ayle Trailblazer

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    Not forgetting that you also lose performance for the sake of reliability.
     
  6. K-TRON

    K-TRON Hi, I'm Jimmy Diesel ^_^

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    MicroDIMM was only used by SONY in a few laptops

    All laptop memory is unbuffered, there is not one laptop made which supports Buffered memory
    There are buffered sodimm's out there, just beware of them, they are usually used on raid cards, server workstation cards, old matrox cards, and some server motherboards

    If you have a laptop, you want to buy standard sodimm memory

    Error checking memory is as fast if not faster than unbuffered memory. I have PC6400ECC memory in my workstation, it generates more bandwidth than the PC6400 corsair in my brothers desktop


    K-TRON
     
  7. vaw

    vaw Notebook Deity

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    So both SODIMM and UDIMM are unbuffered, according your explanations, then what's the difference? I was looking at lenovo outlet and saw most x61s had UDIMM, while x61 had SODIMM.
     
  8. Commander Wolf

    Commander Wolf can i haz broadwell?

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    They're the same thing. SODIMMs are unbuffered DIMMs.
     
  9. sgogeta4

    sgogeta4 Notebook Nobel Laureate

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    What is the link you found the terms? Is it "uDIMM" or "UDIMM". The first is microDIMM, which is a different form factor. The "u" is actually the greek letter "mu" which means micro. Some small form factor notebooks use this type of memory.
     
  10. K-TRON

    K-TRON Hi, I'm Jimmy Diesel ^_^

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    Micro dimms are about 1/2" shorter in length than a standard sodimm memory card.

    When UDIMM = unbuffered memory, than it is the same thing as sodimm memory

    There are three categories of sodimm memory, DDR, DDR2 and DDR3
    You need to know which your system uses, so that you buy the proper memory. Each DDR type has a different slot, so you cant put DDR3 memory into a DDR2 slot, and so forth

    K-TRON
     
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