You can tell if it is ATX or AT by looking at how the board attaches to the case and how the ps is connected. ATX will fill the widest hole out if this is a dual case. AT uses two 1 inch long power connectors... ATX uses one long 2 incher. (measurements ae approx. as they might be slightly off... not sure if they are exactly that) Most newer cases can fit ATX, AT, and P4 boards... you just need the appropriate ps. If those links don't id the mobo you can look up the fcc id HERE.
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