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Version: 2.0.0Built Date: 02/09/2026

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OWC - Mercury Helios 3S Thunderbolt 3 PCIe Expansion Solution - Black
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About this product

Using a video, audio, storage, network, or even gaming PCIe card with a Mac Pro or PC desktop is a simple matter of inserting your card into an open slot. But what do you do if you have a laptop or even a space-confined desktop like an iMac or Mac mini that doesn't contain a PCIe slot? The OWC 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. Instead of buying one or more function-dedicated Thunderbolt interface devices, you can use Mercury Helios 3S like a dock for multiple PCIe cards. Capture incredibly high-quality audio with a PCIe audio card and then retask Helios 3S with a PCIe SSD card to edit and archive tracks. You can swap cards in minutes, adding a new level of flexibility to your workflow. 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
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OWC Mercury Helios 3S Thunderbolt 3 PCIe Expansion Solution

Unlock the full potential of your creative workflow with the OWC Mercury Helios 3S. This sleek black expansion solution allows you to connect PCIe cards via Thunderbolt 3, providing lightning-fast data transfer speeds of up to 40Gb/s. Perfect for video editing, audio production, and 3D rendering, it supports a wide range of PCIe cards, including graphics and storage options. Its compact design ensures portability, while the robust aluminum chassis offers durability. Enhance your setup and streamline your projects with this powerful expansion solution that brings professional-grade performance to your fingertips.