Sonnet designed the Echo Express Thunderbolt 2 PCIe card expansion systems (and some Thunderbolt 2 adapters) to be easily upgradeable to 40Gb/s Thunderbolt 3. Simply replace the existing Thunderbolt interface card with the upgrade card, and your chassis will instantly support higher performance and connect to your Thunderbolt 3-equipped computer without requiring an adapter. With a Thunderbolt 3 interface card installed, your upgraded Echo Express Thunderbolt 2 system gains 30% to 100% additional bandwidth compared to the original system. When installed in an upgraded system, PCIe cards with high bandwidth requirements, such as 16Gb Fibre Channel cards and 4K video I/O cards supporting high frame rates, can perform even better than before. Features -Easy to install 40Gb/s Thunderbolt 3 upgrade card - Replaces existing 20Gb/s Thunderbolt interface card in your Thunderbolt 2 PCIe card expansion system -Enhanced performance with high-bandwidth PCIe cards - Your upgraded expansion system will provide 30% to 100% additional bandwidth for installed PCIe cards -Two Thunderbolt 3 (USB-C) ports - One port dedicated for computer connection; second port supports daisy-chaining of up to five additional Thunderbolt devices, connecting a single USB device, or connecting up to two 4K displays or one 5K display -ThunderLok 3 compatible - Thunderbolt connector retention clip secures cable against accidental disconnections