Motherboard
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Motherboard Form Factor[1] [2]
| Name | Size | Mount Holes | Max. Expansion slots | Notes |
|---|---|---|---|---|
| Micro-ATX | W9.6 x L(6.7 to 9.6) inches | Up to 8 mounting holes ( two of them are optional) | 4 | ATX standard |
| Standard ATX | W12 x L(6.7 to 9.6) inches | Up to 10 mounting holes ( four of them are optional) | 7 | most of the time referred to as simply “ATX” |
| SSI-CEB | W12 x L(9.6 to 10.5) inches | Up to 8 mounting holes are available | 7 | common to lower end dual CPU motherboards |
| SSI-EEB | W12 x L(10.5 to 13) inches | Up to 11 mounting holes are available | 7 |
|
| SSI-MEB | W16 xL13 inches | Up to 14 mounting holes are available | 7 | This form factor is common to quad CPU motherboards |