Variants
Several ATX-derived form factors have been specified that use the same power supply, mountings and basic back panel arrangement, but set different standards for the size of the board and number of expansion slots. Standard ATX provides 7 slots at 0.8 in (20 mm) spacing; the popular Micro-ATX size removes 2.4 inches and 3 slots, leaving 4. Here width refers to the distance along the external connector edge, while depth is from front to rear. Note each larger size inherits all previous (smaller) colors area.
| Name | Width | Depth | Color in image |
|---|---|---|---|
| FlexATX | 9 in (229 mm) | 7.5 in (191 mm) | |
| microATX and EmbATX | 9.6 in (244 mm) | 9.6 in (244 mm) | |
| Mini ATX | 11.2 in (284 mm) | 8.2 in (208 mm) | |
| Standard ATX | 12 in (305 mm) | 9.6 in (244 mm) | |
| EATX (extended ATX) | 12 in (305 mm) | 13 in (330 mm) | |
| EEATX (enhanced extended ATX) | 13.68 in (347 mm) | 13 in (330 mm) | |
| WTX (workstation ATX) | 14 in (356 mm) | 16.75 in (425 mm) |
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