Not full ATX size mobos?

Why does the Asrock z77 Pro 3 say "full atx" even though it slips out of the standard atx size? (12"x9.6") Boards like the z77 extreme 4 and pro 4 are the same. extreme 6 and above are full size though.

Does this mean that the mounting holes are in the same place? If so, does that mean that one side of the board, won't have mounting holes? I heard that the extreme 4 will be hanging on one side because of this, does this apply to the z77 pro3? I also don't understand why Asrock doesn't just make all their atx boards the standard size.
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More about full size mobos
  1. There's approximately 1" that isn't supported. If you're worried, you can support it using plastic standoffs. You'll need to cut them if the case doesn't have holes to mount them: http://www.pccables.com/03002.html
  2. Every square millimeter of board space cost money. If the extra space is not needed then the board manufacturer can reduce its manufacturing cost.

    Mounting holes are standardized.
  3. GhislainG said:
    There's approximately 1" that isn't supported. If you're worried, you can support it using plastic standoffs. You'll need to cut them if the case doesn't have holes to mount them: http://www.pccables.com/03002.html


    Oh, so I just have to be careful when plugging in the connectors in that area?

    Do the plastic stand offs go at the holes I encircled with red?

  4. Yes, those are the two holes that the plastic standoffs would be inserted.

    You can use the plastic motherboard standoffs that don't require any cutting or modification.

    http://www.amazon.com/StarTech-Plastic-Motherboard-Standoffs-Computer/dp/B00032Q33S
  5. ko888 said:
    Yes, those are the two holes that the plastic standoffs would be inserted.

    You can use the plastic motherboard standoffs that don't require any cutting or modification.

    http://www.amazon.com/StarTech-Plastic-Motherboard-Standoffs-Computer/dp/B00032Q33S


    Yeah, I'd prefer that. Thanks for the link. :)
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