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For Release: April 8, 2021

For more information, please contact:

Martin Muggee
Marketing Communications Manager


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  IRVINE, Calif. — April 8, 2021

Sonnet Announces Professional, Dual-Slot 40Gbps Thunderbolt™ Card Reader for SxS™ PRO X Media

What’s New:
Sonnet Technologies today announced the SF3™ Series – SxS™ PRO X Card Reader, the latest model in its family of professional media readers and the upgraded replacement for its popular original model in the lineup. The SF3 Series – SxS PRO X Card Reader features dual card slots and a dual-port 40Gbps Thunderbolt™ interface. Developed to support the requirements for shooting stable 4K video at high bit rates, SxS PRO X is the latest SxS memory card created by Sony® for use as onboard recording media in some of their latest pro digital video cameras and camcorders.

What It Does:
Compatible with Mac® and Windows® computers, the SF3 Series – SxS PRO X Card Reader ingests footage from all SxS media at up to their maximum supported speeds. Designed for demanding workflows, SF3 Series card readers are built with rugged aluminum enclosures and dual 40Gbps Thunderbolt ports, enabling users to stack and connect up to six readers in a daisy chain to their computers through a single cable and ingest footage from four, six, or more cards simultaneously.

Why It's Important:
Featuring an upgraded interface (PCIe® 3.0 x2), SxS PRO X cards can support nearly 3x-faster read speeds (up to 1,250 MB/s) compared to last-generation (SxS Pro+) cards, but only when used with a card reader with the new interface like the SF3 Series – SxS PRO X Card Reader. Not only can the Sonnet reader support up to the maximum SxS PRO X card read speeds, but for even greater efficiency it can read two cards simultaneously at up to 2,500 MB/s and cut ingest times by more than half compared to other readers.

How It's Distinctive:
Sonnet’s SF3 Series – SxS PRO X Card Reader is the only dual-slot SxS PRO X card reader available. The capability to stack multiple SF3 Series – SxS PRO X, CFexpress™ / XQD™, RED MINI-MAG®, and CFast™ 2.0 readers in the same footprint is convenient for DITs working multicamera shoots or in a small workspace, while the ability to connect them all to a computer through a single Thunderbolt cable is game-changing. Support for ingesting multiple cards simultaneously means that users can complete the process — without swapping cards — in as little as one-sixth of the time required using single-slot readers. For users who need to mount their gear in equipment racks, Sonnet SF3 Series readers include threaded mounting holes to support installation in a standard rack shelf, enabling side-by-side mounting of two readers in 1U of rack space.

When You Can Get It:
The SF3 Series – SxS PRO X Card Reader (part number SF3-2SXSPX) is expected to be available from Sonnet in late April at a suggested retail price of $299.99.

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About Sonnet Technologies
Sonnet Technologies, Inc. is a leading provider of Thunderbolt™ technology products, including PCIe® card expansion systems; external graphics (eGPU) solutions for pro users and gamers; pro media readers; docks and adapters; and network, storage, and other interface cards for pro users in the audio, video, and broadcast industries. Sonnet’s Thunderbolt expansion products enable the use of pro audio I/O and DSP cards, pro video capture and transcoding cards, GPU cards, network and storage interface cards, and other high-performance PCIe cards with Thunderbolt technology-enabled computers. For 35 years, Sonnet has pioneered and brought to market numerous innovative and award-winning products that enhance the performance and connectivity of Mac®, Windows®, and Linux® computers. More information is available at


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