The Blackmagic Design PCIe Cable Kit allows you to connect your UltraStudio 4K Extreme to your computer. This kit includes a high-speed Generation 3 PCI express plug-in card and cable that delivers higher data transfer speeds than Thunderbolt. The PCIe adapter card needs to be installed in the computers PCIe slot which the cable connects to your UltraStudio 4K Extreme’s port to the PCIe port at the back of your computer.