How to read the capacity of RAM *DELETED*

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  1. The thing is, it looks like there's no standard on memory marking, but I'm not sure.

    What I know for sure, if even somewhere there are standards in computer industry, but not everybody bothers to follow them always and right away.

    For some known brands and some others I dealt with, I can recognize the capacity of the chips following the chart provided by the manufacturer.

    If you really trying to identify a particular chip, it is best to consult the manufacturer catalog for more info.
    For example,

    for <A HREF="http://www.crucial.com/" target="_new">crucial</A>
    you can read something like that:
    MT41LC1M64E5TG-7 S ,
    where M64 stands for 64 Megabits,
    and some more info you might be interested in:
    41 is SDRAM, LC=3.3V Vcc CMOS,
    -7=143MHz is Access/Cycle time.

    Also <A HREF="http://www.kingston.com/tools/umg/newumg04.asp" target="_new">http://www.kingston.com/tools/umg/newumg04.asp</A>.
  2. Here is a trick for figuring out the capacity of a SIMM or DIMM module when it is not clearly tagged or labeled...
    1)Count the chips, and find the chip type:
    For example: qty:(8) 8x16's =
    2)The 8x16 represents 128Mbit technology....because 8x16 =128
    3)X's the quantity of chips (8) by the "bit" technology (128Mb)
    8x128 = 1024Mb
    ***1024 represents the number of bits, not Megabytes.***
    4)Divide this number by 8 (the number of bits per Byte) and you have 128MB

    Voila! (8) 8X16 = 128MB module.
    Lastly, if you can not tell the chip type (8X16, 32X8, 64X4) you can go the OEM Semiconductor's web site. Most have an archive of chip numbers available to the public.
    PSS: This changes slightly for ECC and parity memory. Count the chips in sets of 4. Any additional chips perform the Parity or ECC function.
    Hope this helps.
    PSS: If you have Rambus ... well because they get so hot there is a heat dissapator, and you can't spec the build! Those Mensa's...
  3. Thank you very much, Brian.
    Really, clear as Vodka now.
  4. Here is a decoder site for Samsung DRAM, but you need to know the DRAM part number first.

    <A HREF="http://www.samsungusa.com/cgi-bin/nabc/semiconductors/dram/part_number_decoder/part_number_decoder.jsp?BV_SessionID=@@@@1698563516.0999297550@@@@&BV_EngineID=halllclmghmbedicfcffcgfm.0&family=DRAM" target="_new">http://www.samsungusa.com/cgi-bin/nabc/semiconductors/dram/part_number_decoder/part_number_decoder.jsp?BV_SessionID=@@@@1698563516.0999297550@@@@&BV_EngineID=halllclmghmbedicfcffcgfm.0&family=DRAM</A>

    JC-------<*){{{>{~~~~~
    Fisher of men
  5. Thanks, NickM ... I answer these types of questions for 1000's of customers and roughly 100 Sales Representatives on a daily basis - hence I get paid the big bucks. No really, I love Tom's Hardware, and if there are any questions folks have about memory that is seated in routers, servers, desktops, workstations, printers, camera's, toasters (you get the idea)... I aim to drop in my 2 cents when there is a certain answer. Up until 2 years ago I was a network engineer (monkey), and all I knew about memory could be summed up in 2 words: SIMMs and DIMMs. Now working for a Memory manufacturer, I have learned that there are numerous nuances (buffered, registered, Cas Latency's) and multiple memory types (EDO, FPM, DDR, SDRAM)and plenty of pin-out PCB packages (72, 100, 168, 184, 200 et all). The particular genius of Tom's Hardware is its integrity, strong methodology, informative, and "dead on" cutting edge technology reporting and benchmarking. Corporate America reads and listens to "Tom's". Many of our Fortune 100 Customer's have recited information from "Tom's" as if they did the research themselves. So come-on with ANY memory questions >>> Perhaps we can add to the THG community...
    Brian
  6. Quote:
    Really, clear as Vodka now.


    Just thought I'd give a w00t! for Max Payne.


    <font color=blue>Quarter pounder inside</font color=blue>
    <font color=red>Change the Sig of the Week!!!</font color=red>
  7. Brain, Thanks! I got my memory back!
    By the way, I just came back from Denver 2 weeks ago. We should have met each other earlier. But, you are welcome to Chicago.
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