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Thread: Pentium 133 board question

  1. #1

    Default Pentium 133 board question

    Hello all again,
    I received a 1997 pentium 133 machine and have a question about the motherboard. I can’t find any model code online. It has 3 SIMM slots but beneath it it also appears to have 2 DIMM slots. Was this common for this generation of Pentium? Can all the slots be populated or is it either the SIMM or the DIMM? Does anyone else have a machine like this?
    Thanks,
    Ian

  2. #2

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    It can't have 3 SIMM slots as SIMMs work in pairs. So it's either 2 or 4 SIMM slots.

    I have a board with both SIMM and DIMM slots. The manual shows some configurations with both SIMM and DIMM memory together however it notes that the manufacturer does not recommend mixed mode usage.
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    Quote Originally Posted by KD2IXL View Post
    Hello all again,
    I received a 1997 pentium 133 machine and have a question about the motherboard. I can’t find any model code online. It has 3 SIMM slots but beneath it it also appears to have 2 DIMM slots. Was this common for this generation of Pentium? Can all the slots be populated or is it either the SIMM or the DIMM? Does anyone else have a machine like this?
    Thanks,
    Ian
    Try matching it up here: https://stason.org/TULARC/pc/
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    A picture and the chipset information may help the rest of us identify the board.

    Is one memory slot separated from the rest? It may be a COAST socket for cache instead of a RAM socket.

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    Quote Originally Posted by Stone View Post
    It can't have 3 SIMM slots as SIMMs work in pairs. So it's either 2 or 4 SIMM slots.
    This was only true of 30 pin SIMMs, but is not true of 72pin simms. I have some 486 boards that can run with a single 72pin SIMM in them.

    In general most boards that have support for both generally won't allow for both to run together, and even if they do there would be some sort of tradeoff, usually in performance (ie the faster DIMM modules would be forced to run at the speed/refresh rate of the SIMMs). OP plan on one or the other, but I'd recommend the DIMMs and not the SIMMs.

    EDIT: As Stone points out below, in general Pentium boards needed 72pin SIMMs to be installed in pairs. If your board has 3 of these sockets, then it maybe one of the few exceptions to this rule.
    Last edited by lutiana; October 17th, 2019 at 08:13 AM.

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  6. #6

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    Quote Originally Posted by lutiana View Post
    This was only true of 30 pin SIMMs, but is true of 72pin simms. I have some 486 boards that can run with a single 72pin SIMM in them
    Pentium boards require pairs and this is what the OP has.
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  7. #7

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    Quote Originally Posted by Stone View Post
    Pentium boards require pairs and this is what the OP has.
    That's not entirely true. Maybe it applied on early Pentiums chipsets or was the most common case, but definitely not a generic rule. Also this is clearly a late socket 7 motherboard as it has DIMM sockets.
    I've only seen this on boards with 2 SIMM + x DIMM sockets like lutiana said to be fair, I've never seen 3.
    Last edited by konc; October 17th, 2019 at 02:38 AM.

  8. #8

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    Quote Originally Posted by konc View Post
    That's not entirely true. Maybe it applied on early Pentiums chipsets or was the most common case, but definitely not a generic rule. Also this is clearly a late socket 7 motherboard as it has DIMM sockets.
    I've only seen this on boards with 2 SIMM + x DIMM sockets like lutiana said to be fair, I've never seen 3.
    Yes, it is true. The 'pairs' referred to SIMMs and all Pentiums require two SIMMs to complete a bank. DIMMs were not part of the discussion here.
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  9. #9

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    Quote Originally Posted by Stone View Post
    Yes, it is true. The 'pairs' referred to SIMMs and all Pentiums require two SIMMs to complete a bank. DIMMs were not part of the discussion here.
    Maybe I wasn't clear, I've had a very late socket 7 motherboard with 2 SIMM sockets (+DIMMs but as you said it's irrelevant) that works with 1 SIMM installed. Uncommon? Sure. But it exists.

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    Though without more information from the OP, it will be difficult to ascertain the specifics of that board. Might be a mistake in the description, might have a slot to nowhere or a slot that isn't for main memory, or might have a memory controller able to use of an odd number of SIMMs.

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