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Thread: Mini-ITX Layout Specifications?

  1. #1
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    Mini-ITX Layout Specifications?

    Does anybody know where I can find specifications for the physical layout of Mini-ITX motherboards?

    Information I'm looking for:

    1. Motherboard mounting hole layout, w/dimensions.
    2. Rear I/O shield dimensions, of the hole in the case. Same as ATX?
    3. Dimensions of PCI slot openings, when used with the 2-slot PCI right-angle adapters. Also in relation to the I/O shield opening.


    If anybody has a Mini-ITX case with 2 or more horizontal PCI slots, and would care to take measurements, I would appreciate it.

    Use millimeters, if you can.

    Thanks!

  2. #2
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    http://www.viavpsd.com/download/index.jsp

    try here to start....depends on which one your looking at

    Yes, they are atx comaptible fully, i have had one in a full size atx, it looks quite silly thru the window in the side

    As far as the pci riser, depends on the one you buy, they are not included with the board, rather with the case you buy.
    2005 Ford Focus ST

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    Giuliano,

    Try this for the mobo mounting points http://www.mp3car.com/vbulletin/atta...achmentid=1625

    I know that the absolute minimum height of a epia case is about 46mm which allows 5mm for the mobo mount spacers and 1mm of play, and 40mm for the 3 audio jacks, they are the talles component on the entire mobo.

    Hope this helps

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    Quote Originally Posted by lummox
    Giuliano,

    Try this for the mobo mounting points http://www.mp3car.com/vbulletin/atta...achmentid=1625

    I know that the absolute minimum height of a epia case is about 46mm which allows 5mm for the mobo mount spacers and 1mm of play, and 40mm for the 3 audio jacks, they are the talles component on the entire mobo.

    Hope this helps
    Excellent, thanks, that'll help immensely.

    I already laid out the mounting holes based on other specs, and I'll double-check that diagram to make sure.

    I fleshed out an opening for an ATX-size I/O plate, which just barely fits.

    I'm working on the openings for the 2 PCI slots - I'll take measurements from a standard ATX case for the hole dimensions.

    I have about 100mm of vertical space to work with, it should be just enough for the 2 PCI slots.


    Now to find diagrams for an appropriate riser card..

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    Easily enough space, good luck!

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    Quote Originally Posted by lummox
    Easily enough space, good luck!
    When factoring in the size of an ATX I/O plate, 2 PCI slots horizontally on top doesn't leave a lot of room.

    That, and I'd have to find a riser card that put the 2 PCI slots at JUST the right height, and facing over the board instead of away from it.


    Finding one that fits perfectly, or calculating measurements to see if it'll fit, is more difficult than it appears.

    Right now I'm thinking of using a single-PCI riser, but one that uses flexible ribbon cable to make the connection.

    That way I can have the slot hole cut out nearly anywhere, and not have to worry as much about exact measurements.


    Something like this:

    http://www.mycableshop.com/sku/PCIRX4-FLEX-FM.htm

    The socket on top would have to flip over to the other side for it to work correctly - shouldn't be an issue, the cables are long enough.

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    PCI Bracket mounting.

    I figured out how I'll get the PCI slot opening cut, and how the PCI card and PCI riser extension will be mounted to the case.

    See attached MS Paint sketch.

    Start off with a simple rectangle opening, the size of a PCI slot opening at the rear end of a case.

    Cut lines to form two tabs at top and bottom, shown in black, on the left-hand sketch.

    The thin horizontal lines at the top and bottom of the left-hand sketch represent bend lines - bend the top tab out, and bend the bottom half in, as represented by the Blue (top) line, and the Red (Bottom) line in the right-hand sketch.

    The PCI riser slot will be secured to the bottom tab (red), and the bottom of the PCI card bracket will go through the notch formed by the lower tab's bend. The top of the PCI card bracket will go through the hole formed by the top tab (blue), and will be secured to the blue tab by a standard computer screw.


    Best part is, with the PCI Riser Slot connected to the motherboard with a ribbon cable, I can put the PCI slot opening wherever it's convenient, within space limitations.

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    60$ seems quite pricey for the extender to me, but what do i know!

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    Quote Originally Posted by lummox
    60$ seems quite pricey for the extender to me, but what do i know!
    Well, there is this adapter for $30:

    http://www.mycableshop.com/sku/PCITX4-4-3B.htm

    The connector's height is 1.7", or about 43mm, which should be enough to clear the I/O shield.

    But figuring out the actual measurements will be a little tricky, when you have to consider the height of the motherboard mounts, the motherboard, and the PCI slot itself.

    It'll have to take some thinking..

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