XTX is fully compliant to the ETX specification with the exception for X2 (ISA bus) connector signal definition. The ISA bus signals on the X2 connector have been replaced by state of the art interface technologies such as:
- PCI Express
- Express Card
- Serial ATA
- 6 x USB 2.0
- Digital Audio Interface (AC'97 or HDA)
- LPC Interface
- Additional control signals
XTX is an expansion and continuation of the well-established and highly successful ETX standard. XTX offers the newest I/O technologies on this proven form factor. Now that the ISA bus is being used less and less in modern embedded applications XTX offers an array of different features on the X2 connector than those currently found on the ETX platform. These features include new serial high speed buses such as PCI Express, SATA, Express Card, LPC Bus, Extended Power Management, 6 USB 2.0 devices, Digital Audio. All other signals found on connectors X1, X3, and X4 remain the same in accordance to the ETX® standard and therefore will be completely compatible.