| Name | PCB Size (mm) |
|---|---|
| WTX | 356×425 |
| AT | 350×305 |
| Baby-AT | 330×216 |
| BTX | 325×266 |
| EATX (Extended) | 305×330 |
| LPX | 330×229 |
| NLX | 254×228 |
| microATX | 244×244 |
| DTX | 244×203 |
| FlexATX | 229×191 |
| Mini-DTX | 203×170 |
| EBX | 203×146 |
| microATX (Min.) | 171×171 |
| Mini-ITX | 170×170 |
| EPIC (Express) | 165×115 |
| ESM | 149×71 |
| Nano-ITX | 120×120 |
| COM Express | 125×95 |
| ESMexpress | 125×95 |
| ETX / XTX | 114×95 |
| Pico-ITX | 100×72 |
| PC/104 (-Plus) | 96×90 |
| mobile-ITX | 75×45 |
| Ultra ATX | ?×244 |
Ultra ATX is a non-standard motherboard form factor introduced by Foxconn. In principle, it is simply an oversized version of ATX that supports 10 expansion slots, as opposed to the seven slots of ATX, and it requires a full-tower computer case to support the added height of the motherboard.[1]
Purpose
Video cards often trend towards double-slot designs, due to the need for a large heatsink to effectively cool the graphics chipset. As a consequence, the expansion slot below the slot used by the graphics card is effectively blocked and cannot be used. This leaves an ATX quad-graphics system with effectively no expansion slots, as all of the additional slots are blocked by the video cards. The main purpose of Ultra ATX is to overcome this limitation and allow high-end systems to incorporate quad-graphics with additional room for expansion.
References
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