Today's ultra-light notebooks, mini, and all-in-one desktop computers now have tremendous processing power - power that many thought would only be possible in full-size workstation or large desktop computers. For pros in the creative fields, processing power alone is not enough. Reviewers love its performance, but make a point of mentioning its lack of internal expansion capabilities compared to the old towers the model replaces. If you want to add more capabilities, think external - the Pro is loaded with Thunderbolt 2 and USB 3.0 ports, but it lacks the PCIe expansion slots necessary for you to install specialty audio, video, networking, and storage controller interface cards. With the Echo Express SE I, Sonnet has created a solution that leverages the paradigm shift enabled by Thunderbolt technology, allowing PCIe expansion slots to be connected outside a computer. This desktop Thunderbolt 2-to-PCIe card expansion system is ideal for connecting one professional video capture, audio interface, SAS or SATA HBA, 10Gigabit Ethernet, or RAID controller PCIe card to any Mac or Windows PC with a Thunderbolt port.