Computer Tech Knowledge - ATX Motherboard Sizes ATX (Advanced Technology eXtended) is a motherboard configuration specification developed by Intel in 1997 to improve on previous de facto standards like the AT design.
Computer-Hardware-Store - Motherboard sizes vary. Form big to small: EATX, ATX,Micro-ATX, Mini-ATX. | Facebook
![I need help for dimensions between holes on miniITX motherboard and dimensions for backside | [H]ard|Forum I need help for dimensions between holes on miniITX motherboard and dimensions for backside | [H]ard|Forum](https://cdn.hardforum.com/data/attachment-files/2019/10/243023_Motherboard_Mounting_side_.jpg)