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Sonnet Echo Express III-D Thunderbolt 2 Expansion System

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The Sonnet Echo Express III-D Thunderbolt 2 Expansion System allows you to use up to 3 PCIe cards with any Thunderbolt-equipped computer.  An ideal solution for professionals workings within creative fields that require powerful PCIe connectivity for audio, video, networking and storage applications, but who are limited by the lack of internal expansion capabilities built into the latest Mac computers! This desktop Thunderbolt-to-PCIe card expansion chassis makes it possible for you to connect three professional video capture, audio interface, SAS or SATA HBA, 16Gb or 8Gb Fibre Channel, 10Gigabit Ethernet, and RAID controller PCIe cards to any Mac with a Thunderbolt port.

    • Sonnet Echo Express III-D PRODUCT FEATURES:

      Featuring 20Gbps Thunderbolt 2 technology that provides sufficient bandwidth to support many of the highest performance and most demanding PCIe cards, the Echo Express III-D delivers maximum performance when connected to a computer with Thunderbolt 2. The III-D is also fully compatible with computers with 10Gbps Thunderbolt technology, supporting the majority of cards at full-performance.

      Provides PCIe Card Expansion—Use high-performance PCIe cards with any Mac with a Thunderbolt port

      Thunderbolt 2 Interface—Maximum performance with computers with Thunderbolt 2 technology, backward compatible with host computers and other devices equipped with 10Gbps Thunderbolt technology

      Upgradeable—When available, upgrade to 40Gbps Thunderbolt 3 Technology with a replacement Thunderbolt interface card

      Three PCIe Slots—Supports three full-length, full-height, single-width cards, or one double-width card plus one single-width card

      Remarkably Quiet—Large, temperature-controlled, variable-speed fans that automatically cool the cards, plus computer-modeled design that reduces airflow turbulence and velocity, combine to provide quieter cooling for all cards

      Integrated Universal Power Supply—Built-in 300W power supply with 75W auxiliary power connector

      Rugged Aluminum Housing—Provides robust and secure protection for any environment

      Every Thunderbolt-Compatible Card Supported—Works with every Thunderbolt-compatible PCIe card, regardless of length or height

      AVID Qualified for Pro Tools|HDX & HD Native and Media Composer/Symphony

      5-Year Warranty Included at No Extra Cost—No extra charge for a 5-year warranty

      Thunderbolt Cable & ThunderLok Included—Includes Thunderbolt cable and ThunderLok Thunderbolt connector retainer clip to secure cable from accidental disconnections

      Part No.



      Echo Express III-D Thunderbolt 2-to-PCIe Card Expansion System(1)





      Form Factor

      Desktop Thunderbolt 2-to-PCIe card expansion system

      External Connectors

      Two Thunderbolt 2 ports

      Internal Connector

      6-pin Mini-Fit Jr (same type as on legacy Mac Pro motherboard; provides up to 75W of power for PCIe cards that require supplemental power)

      Expansion Slots

      • One x8 mechanical (x8 electrical) PCIe 2.0
      • One x16 mechanical (x8 electrical) PCIe 2.0
      • One x8 mechanical (x4 electrical) PCIe 2.0

      PCIe Cards Supported(1)

      • One full length, full-height, double-width PCIe card, plus one single-width card 

      • Three full length, full-height, single-width PCIe cards

      Compatible PCIe Cards(2)

      Up-to-date PCIe cards listed on our supportingPCIe Card Thunderbolt Compatibility Chart

      Power Supply

      Universal 300W, 115-230V AC, 50-60 Hz(5)

      Operating Temperature

      0˚ C to 35˚ C (32˚ F to 95˚ F)

      Dimensions (WxDxH)

      3.8 x 16 x 10.2 in. (9.7 x 40.5 x 25.9 cm)


      7.5 lbs (3.4 kg)

      RoHS Compliant


      Package Contents

      • Echo Express III-D Thunderbolt 2-to-PCIe Card Expansion System(1)
      • Power cord
      • Thunderbolt cable
      • ThunderLok3)
      • Documentation

      Note: PCIe cards sold separately

    • Sonnet Echo Express III-D SYSTEM REQUIREMENTS:

      Mac Compatibility

      Mac® with a Thunderbolt or Thunderbolt 2 port

      OS X® 10.8.5+

      OS X El Capitan compatible

      PC Compatibility

      PC with a Thunderbolt  or Thunderbolt 2 port(4)

      Windows® 10, 8, 7

      PCIe Card Compatibility

      For up-to-date PCIe card compatibility see our PCIe Card Thunderbolt Compatibility Chart

      For maximum PCIe bandwidth when used with a Mac Pro (late 2013), dedicate one Thunderbolt 2 bus to the PCIe expansion slots. For more info see Sonnet's FAQ Article.

      Technical Notes

      1. PCIe cards sold separately.
      2. Compatibility requires the installation of Thunderbolt technology-aware drivers, available from the manufacturer. See our supporting PCIe Card Thunderbolt Compatibility Chart for a list of up-to-date compatible PCIe cards.
      3. ThunderLok compatible with all copper Thunderbolt cables. Not yet compatible with optical Thunderbolt cables.
      4. Windows requires a Thunderbolt 2 interface in the computer and in the expansion chassis to support more than two PCIe controllers. Note that some PCIe cards have a bridge to multiple controllers, so it is possible for a single dual-controller PCIe card to reach the limit if not connected via Thunderbolt 2. Not all Mac-compatible PCIe cards are also compatible with Windows. See thePCIe Card Thunderbolt Compatibility Chart for details.
      5. Power supply will operate at 90-115V AC, with linear power deration of 240W-300W over that range.

      ** Please note, system requirements may change. For the most recent system requirements please visit the manufacturer's official product listing **

Need more info on the Sonnet Echo Express III-D? Click HERE for the official product listing >>>