- Advanced Technology Extended (ATX):
- 12x9.6 in
- 7 PCI or PCIe slots
- 4 to 8 DIMM slots
- Desktops, Workstations and Gaming computers
- Supports high end GPU’s
- microATX:
- 9.6x9.6 in
- 4 PCI or PCIe slots
- 2 to 4 DIMM slots
- Budget and compact systems
- Information Technology eXtended (ITX):
- Comes in Mini, Nano, Pico
- 1 PCIe slot
- 2 DDIM slots
- Small form factor and low power draw