For Echo Express SEL (Thunderbolt 2 Edition) and SEL-Based Thunderbolt 2 Adapters
Easy to Install 40Gbps Thunderbolt 3 Upgrade Card—Replaces existing 20Gbps Thunderbolt interface board in your Echo Express SEL Thunderbolt 2-to-PCIe card expansion system or SEL-based Thunderbolt 2 adapter
Improves Performance with High-Bandwidth PCIe Cards—Your upgraded expansion system will provide 100% more bandwidth (up to 2750 MB/s) for installed PCIe cards
Two Thunderbolt 3 (USB-C) Ports—Supports daisy-chaining of up to five additional Thunderbolt devices, attaching a single USB peripheral device, or connecting up to two 4K displays or one 5K display
ThunderLok 3-Compatible—Thunderbolt connector retainer clip secures cable from accidental disconnections
Step Up to 40Gbps Thunderbolt 3
Sonnet designed the Echo Express SEL Thunderbolt 2-to-PCIe card expansion system (and select Thunderbolt 2 adapters) to be easily upgraded to 40Gbps Thunderbolt 3. Simply replace the existing Thunderbolt interface board with the upgrade board, and then your chassis will instantly support higher performance, and connect to your Thunderbolt 3-equipped computer without the need for an adapter.
For complete product compatibility list, visit product's webpage.