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Thread: Question about the H77M motherboard

  1. #1
    asrlin7 is offline Junior Member
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    Default Question about the H77M motherboard

    What does this line mean: "Max. capacity of system memory: 16GB*" on ASRock > H77M ?
    Software limit or hardware limit?

  2. #2
    profJim's Avatar
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    Default Re: Question about the H77M motherboard

    Welcome to the forum.

    From the motherboard memory specifications that you linked to:

    *Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows® 32-bit OS. For Windows® 64-bit OS with 64-bit CPU, there is no such limitation.

    **The highest supported DRAM frequency depends on the CPU you’ve installed. For detailed CPU specifications, please refer to Intel® official website.

    With a windows 32-bit operating system, less than 4GB of memory will be recognized.
    With a windows 64-bit operating system, the H77M motherboard can recognize up to 16GB of installed memory.

    To avoid memory compatibility problems, only buy a memory kit from the ASRock memory support list or a memory kit listed on the memory manufacturer's website, where they have tested the specific kit with your motherboard.

    Some memory manufacturers make a blanket statement where they say that a memory kit is designed to work with all Sandy Bridge or other cpu systems. Don't believe it!!
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    parsec's Avatar
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    Default Re: Question about the H77M motherboard

    Hardware limit, an Ivy Bridge CPU's memory controller has a limit of 32GB of DRAM. But since the H77M board has just two DIMM slots, that makes the limit 16GB.

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    asrlin7 is offline Junior Member
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    Default Re: Question about the H77M motherboard

    Quote Originally Posted by parsec View Post
    Hardware limit, an Ivy Bridge CPU's memory controller has a limit of 32GB of DRAM. But since the H77M board has just two DIMM slots, that makes the limit 16GB.
    I have to ask: why impose another limit?

  5. #5
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    Default Re: Question about the H77M motherboard

    Intel set the 32GB memory limit for Ivy Bridge systems.
    8GB is the largest DDR3 memory module size and as stated above, your motherboard only has 2 memory slots so your motherboard's maximum capacity is 2 x 8GB or 16GB total.

    Think of memory capacity as similar to vehicle weight or towing capacity.
    For a vehicle to be able to carry or tow additional weight, everything in the vehicle has to be stronger.
    A one ton truck is stronger and more expensive that a 3/4 ton truck, which is stronger and more expensive than a 1/2 ton pickup truck.
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    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
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  6. #6
    parsec's Avatar
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    Default Re: Question about the H77M motherboard

    Quote Originally Posted by asrlin7 View Post
    I have to ask: why impose another limit?
    Mainly to save money on the price of the board. Two fewer DIMM slots and their connections to the memory controller, etc, and fewer or smaller components to supply power to the DIMMs. A simpler and easier board to design and manufacture.

    A micro ATX board has less area to work with so removing two DIMM slots makes it easier to design and manufacture.

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