Unlock the Full Potential of Your PCIe Cards

The OWC Mercury Helios 3S is a high-performance PCIe expansion solution that brings desktop-grade power and flexibility to Thunderbolt 3-equipped computers. Whether you're working on creative projects, managing large datasets or pushing the limits of professional audio and video workflows, this external enclosure enables you to use a wide range of PCIe cards without the constraints of your system’s internal space.

Professional Connectivity Without Compromise

With dual Thunderbolt 3 ports delivering up to 40Gb/s transfer speeds, the Mercury Helios 3S ensures smooth, high-bandwidth performance across all supported applications. From high-resolution video capture to fast data storage or 10GbE networking, this expansion chassis keeps your workflows responsive and reliable, even under heavy load.

Transform How You Work with Greater Flexibility

Designed for versatility, the Helios 3S features a single PCIe x16 slot that accommodates half-length, full-height cards — including single or double-width models. Switching between cards is effortless, requiring no tools and minimal downtime. Whether you're capturing 4K footage, enhancing audio production with DSP acceleration, or upgrading your network interface, the Helios 3S adapts to your needs quickly and easily.

Expand Your Capabilities

In compact setups like a Mac mini or iMac, the Helios 3S allows you to extend your system’s functionality without internal modification. It supports a wide variety of pro-grade PCIe cards from brands including Blackmagic Design, Universal Audio, Avid, Intel, and more. From SSDs and video capture cards to 10GbE adapters and audio interfaces, you can tailor your setup to meet the demands of your work.

Enhanced Productivity in a Streamlined Design

The integrated DisplayPort 1.4 enables you to connect displays up to 8K resolution, perfect for creative professionals who need expansive visual space. While you work, your notebook stays powered with 85W charging over Thunderbolt, helping to reduce cable clutter and keep your desk tidy. You can even daisy-chain up to five additional Thunderbolt devices for a seamless, scalable setup.

Simple Setup, Instant Results

The Mercury Helios 3S requires no additional drivers or configuration. Simply connect it to your Thunderbolt 3 port using the included cable, install your PCIe card of choice, and you’re ready to go. In your studio, office, or if you’re creating a remote setup, this tool-free design lets you get up and running in minutes.