The Mercury Helios 3S is an easy to use yet powerful expansion solution that adds an external PCIe slot to your Thunderbolt 3 equipped computer. Now you can maximize your existing PCIe card investment — or expand it! — while enjoying the flexibility of adding professional-class video production, transcoding, audio processing, data storage, and high-speed network connectivity to your machine.

With dual 40Gb/s Thunderbolt 3 ports, the Mercury Helios 3S offers the bandwidth needed to support data-intensive 4K capture cards to speed up diverse video workflows such as vlogging. Boost your DAW with external DSP acceleration and run larger mixes with multiple plug-ins. Live stream the action in your gaming sessions or share files over a 10GbE or Fibre Channel network without any speed throttling.

Mercury Helios 3S supports a wide variety of half-length, full-height, single or double-width, pro-level PCIe cards from leading brands like AJA, Apogee, ATTO, Avid Pro Tools, Blackmagic Design, CalDigit, HighPoint, Intel, Solid State Logic, Universal Audio, and OWC.

• Video capture


• Digital audio


• Solid State Drive (SSD)


• 40GbE/10GbE network adapters


• SAS controllers


• Firewire, USB, or eSATA host adapters