Sonnet's Echo Express III enables you to connect three compatible full-size professional video capture, audio interface, and other special-purpose cards to your iMac, Mac mini, new Mac Pro®, MacBook Air, or MacBook Pro with a Thunderbolt port.
Thunderbolt 3 Upgrade Card for Echo Express III-D & III-R
Sonnet - External video adapter - Thunderbolt 3 - 2 x DisplayPort
Sonnet Echo Express SE I - Thunderbolt 3 Edition - system bus extender - 60 Watt
Sonnet ThunderLok 3 Thunderbolt Connector Retainer Clip - Cable retainer (pack of 2)
Sonnet's eGFX Breakaway Box, a Thunderbolt 3 to PCIe card expansion solution, supports any Thunderbolt compatible PCIe card, but is designed specifically for bandwidth-intensive video graphic cards.
Sonnet Echo Express SEL - Thunderbolt 3 Edition - system bus extender - 60 Watt
Sonnet Thunderbolt 3 Upgrade Card - Thunderbolt adapter - PCIe - Thunderbolt 3 / USB-C 3.1 x 2
Sonnet eGFX Breakaway Box 350 - System bus extender - 500 Watt