Thunderbolt 2 Technology 2X Faster than original Thunderbolt and 4X faster than USB3.0. Daisy-chain up to 9 devices per port with improved transferring speed up to 20 Gb/s. Simply Plug and Upgrade! - Compatible with all the Thunderbolt devices. ThunderboltEX II delivers all the bandwidth you need. Experience video in incredible detail on the latest 4K/UHD (ultra-high-definition) displays while using bandwidth-hungry storage devices at the same time. The Thunderbolt 2 port also supports DisplayPort 1.2, meaning you can attach up to three 1080p displays.