HDX is a system that includes the interface as part of the equation. It is as if, you have the power of a large computer, inside your large computer, running Pro Tools and its processing. HDX gives you a direct connection to Avid HD Interfaces, up to 64 I/o per card, for bullet proof integration with the software's frame. It has extremely low latency and the Avid interfaces also have extremely low residual latency. The HDX card has a Cache of DSP Accelerated power for the Pro Tools Environment and background tasks are handled by the DSP on the card, and not your computer. It also has a Cache of DSP for AAX-DSP Plug ins. It is a Scalable Core Card System, and as you add more HDX cards, you add more DSP Power, and more I/O capabilities with HD Interfacing.