The Thunderbolt 3 Option Card for rackmount Apollo audio interfaces allows music and audio producers to connect their Apollo directly to compatible Mac or Windows systems using Thunderbolt 3. This user-installable card offers two Thunderbolt 3 ports, and provides 15W bus power to all downstream Thunderbolt 3 peripherals — perfect for daisy-chaining additional Apollo interfaces and UAD-2 Satellite DSP Accelerators, modern storage solutions, 4K displays, and more. • User-installable Thunderbolt 3 Option card for Apollo rackmount interfaces • Two Thunderbolt 3 USB-C ports for daisy-chaining Apollos or peripherals • Provides 15W bus power to downstream Thunderbolt peripherals • Thunderbolt 3 bandwidth delivers up to 40 Gbps for connecting hard drives, dual 4K monitors, and more • Requires macOS Sierra/High Sierra or Windows 10 w/Anniversary (64-bit Edition)