Connect a half-length, full-height, single- or double-width PCIe card to systems with a Thunderbolt 3 port using the Mercury Helios 3S Thunderbolt 3 PCIe Expansion Solution from OWC / Other World Computing. Built with one PCIe 3.0 x16/x4 slot, the Mercury Helios 3S is useful for expanding the connectivity of systems like the iMac, Mac mini, or MacBook Pro, which do not have the PCIe slots needed for pros working in creative fields. Instead, this solution connects to Thunderbolt 3 hosts to leverage this connectivity via PCIe expansion that is outside of the computer. It can be used for video capture, digital audio, an SSD, 40GbE or 10GbE network adapters, SAS controllers, Firewire, USB, or eSATA host adapters, and more.