pc case

mATX stands for microATX, which is smaller than ATX. mATX boards will fit into ATX cases, but ATX boards are too big for mATX cases. As for the computer you've linked, I can't read the description but just from looking at it I'm pretty sure it's mATX.
 
matx case only fit matx mobo.
atx case usually fit both matx and atx mobo.

Look at the photo, it looks like you've got matx case.
You can open up the case and check.
matx mobo with size of 9.6" x 9.6". atx with 12" x 9.6"
 
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