Sonnet (www.sonnettech.com) has announced the Echo Express SE I, the latest addition to the Echo Express line of Thunderbolt 2-to-PCIe expansion systems.

Like the other members of the Echo Express family, the SE I enables the use of a wide variety of high-performance PCI Express (PCIe) cards — originally designed for use in desktop computers — with any Mac or Windows computer with a Thunderbolt port. The new single-slot model supports nearly every Thunderbolt-compatible PCIe card on the market, including double-width cards (PCIe card plus daughter card). 

The Echo Express SE I features Thunderbolt 2 technology and incorporates support for the DisplayPort 1.2 protocol, which enables video streaming to a 4K video monitor. It's available now for US$349. The updated Echo Express SEL (part is available now for $329.