Short for Information Technology eXtended, ITX is a small motherboard form factor from VIA Technologies that was first introduced in November 2001 with the Mini-ITX. Later versions of ITX include the Nano-ITX released in March 2003, the Mobile-ITX released in March 2004, and the Pico-ITX released in April 2007. With the compact configuration of ITX motherboards, they are often used in low-cost small setups found in cars, network devices, set-top boxes, and other small computers. Below is a picture and comparison of all of the ITX motherboards from VIA.
The Mini-ITX motherboard form factor that measures 17 cm x 17 cm (6.75" x 6.75") in size. They almost always have two memory slots, 1 PCI Express or mini-PCI slot, several USB ports, and one network port. Some Mini-ITX motherboards include an onboard VGA port and an HDMI port.
An important feature of a Mini-ITX motherboard is its low power consumption, using less than 25 watts of power, with some as few as five watts.
The Nano-ITX motherboard form factor measures 7.2cm x 10cm (2.8" x 3.9") and is 75% smaller than the Mini-ITX form factor. The motherboard supports any processor that uses VIA's NanoBGA2 technology with speeds up to 1.5 GHz with 128 KB L1 and L2 cache. Pico-ITX uses DDR2 400/533 SO-DIMM memory with support for up to 1 GB and AGP video with built-in MPEG-2, 4, and WMV9 decoding acceleration.
Mobile-ITX (2.4" x 2.4")
The Mobile-ITX motherboard form factor measures 7.2cm x 10cm (2.8" x 3.9") and has no computer ports unless an I/O carrier board is used. The Mobile-ITX design is intended for medical, transportation and military embedded markets.