Computer Motherboard Form Factors


Below HTPC case series will support ATX motherboard and lower:
  • HTPC 2000
  • HTPC 6000
  • HTPC 8000
  • HTPC 2800
ATX Motherboard

Standard ATX specifies length to be 12 inches with width varying from 6.7 to 9.6 inches.

Maximum number of expansion slots is seven (7)

Up to ten (10) mounting holes are available, although four of them are optional.
 

Below HTPC case series will support Micro-ATX motherboard and lower:
  • HTPC 1000
  • HTPC 1080P
  • HTPC 5000
  • HTPC 7000B

Below HTPC case series will support Mini iTX motherboard:

  • HTPC 1800B

Micro-ATX

DTX

Mini-ITX

 

Micro ATX; DTX & Mini-ITX Motherboard

 

Micro-ATX specifies length to be 9.6 inches with width varying from 6.7 to 9.6 inches, it has three less expansion slots than standard ATX. Maximum number of expansion slots is four (4). Up to eight (8) mounting holes are available. Two are optional.

DTX specifies length to be 8 inches with width varying from 6.7 to 9.6 inches. Mini-DTX specifically refers to DTX motherboards with a width of 6.7 inches. Compared to Micro-ATX, DTX has two less expansion slots. Maximum number of expansion slots is two (2)

Mini-ITX specifies length to be 6.7 inches with width of 6.7 inches. It is the smallest form factor possible utilizing ATX mounting holes. Maximum number of expansion slot is one (1). All Mini-ITX motherboards use four (4) mounting holes, there are no known exceptions. This form factor is the smallest of all ATX motherboards.

 

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