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Easy to Install 40Gpbs Thunderbolt 3 Upgrade Card-Replaces existing 20Gbps Thunderbolt interface board in your Thunderbolt 2-to-PCIe card expansion system Improved Performance with High-Bandwidth PCIe Cards-Your upgraded expansion system will provide from 30% to 100% more bandwidth for installed PCIe cards Two Thunderbolt 3 (USB-C) Ports-One port reserved for connection to the computer; second port 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