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Sonnet Echo III Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System. ECHO-3R-T5
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Sonnet Echo III Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System. ECHO-3R-T5
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System
Sonnettech

Echo III T5 Rackmount Three-Slot Full-Length Thunderbolt 5 PCIe Card Expansion System

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Product SKU: ECHO-3R-T5
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Connect Three Full-Length PCIe Cards to Computers with Thunderbolt 5, Thunderbolt 4, or USB4 Ports

The best portable, mini desktop and all-in-one computers feature powerful CPUs and include high-performance Thunderbolt ports to support peripherals. But they lack the PCIe expansion slots creative pros need to install specialty adapter cards that enable their workflows by adding video and audio inputs, transcoding data, and connecting to high-speed shared storage and networks. Sonnet has a Thunderbolt 5 solution, the Echo III T5 Rackmount, a professional Thunderbolt 5 to PCIe card expansion system. Via a single cable, connect up to three full-length (12.28 inches long) PCIe cards at the same time to your Mac, Windows, or Linux computer.

Echo III T5 Rackmount
Echo III T5 Rackmount supports every Thunderbolt-compatible, non-GPU PCIe card, including video capture, streaming and transcoding; audio DSP; 10Gb and 25Gb Ethernet; SSD storage; SAS host bus adapters; and other specialty card types.

Key Features:

  • For computers with Thunderbolt 5, Thunderbolt 4, or USB4 ports
  • Connects up to three high-performance non-GPU PCIe cards
  • Three PCIe 3.1 slots (one x16 plus two x8 slots) support three full-height, single-width cards, or one double-width card plus one single-width card
  • 3400 MB/s aggregate, bi-directional PCIe bandwidth to the installed cards when connected to a Thunderbolt 5 computer port
  • Every Thunderbolt-compatible, non-GPU card is supported
  • Avid Pro Tools | HDX compatible: use three Pro Tools | HDX PCIe cards with no additional parts needed
  • Pro Power: integrated 400W power supply with 75W auxiliary PCIe power connector
  • Energy Savings: powers on and off automatically with the computer
  • Remarkably Quiet: dual temperature-controlled, variable-speed Noctua fans rated at 17 dBA
  • Rugged 2U steel enclosure, 16.5 inches deep, with adjustable extension rails for racks 16 to 24 inches deep
  • Two Thunderbolt 5 ports: one connects to the computer, the second connects an additional Thunderbolt or USB device and provides 15W to bus-powered devices
  • Connect one 5K display using spare bandwidth while retaining full PCIe bandwidth
  • Space for an additional Sonnet expansion module (sold separately)
  • Includes a 0.8-meter Thunderbolt 5 cable and a ThunderLok-A connector lock
  • Mac, Windows, and Linux compatible
  • Avid Qualified
  • 2-year warranty and lifetime technical support

Package Contents

  • Echo III T5 Rackmount Thunderbolt Expansion System (includes the Echo III T5 Module)
  • Region-specific power cable
  • 6-pin PCIe auxiliary power cable
  • 0.8-meter Thunderbolt 5 cable
  • ThunderLok-A connector lock (for securing the Thunderbolt cable)
  • Extension rails (for rack depth to 16-24 inches)
  • Product documentation

Product Q&A

Q: Which computers can I connect the Echo III T5 Rackmount to?

A: Mac, Windows and Linux computers with Thunderbolt 5, Thunderbolt 4 or Thunderbolt/USB4 ports. Sonnet lists macOS 15 or later (compatible with macOS 27), Windows 11 25H2 or later and Windows Server 2025, and Linux kernel 6.6 or later. Sonnet states that the included Thunderbolt 5 cable is fully compatible with Thunderbolt 5, 4 and 3 computers.

Q: How much PCIe bandwidth do the slots get?

A: When connected to a Thunderbolt 5 computer port, the system provides 3400 MB/s aggregate, bi-directional PCIe bandwidth to the installed cards. The three slots are PCIe 3.1: one x16 and two x8.

Q: What kind of PCIe cards can I install?

A: Every Thunderbolt-compatible, non-GPU card is supported, up to 12.28 inches long. The system supports single- and double-width PCIe 4.0, 3.1, 2.0 and 1.1 cards: three full-height, single-width cards, or one double-width card plus one single-width card. The 75W auxiliary power connector is for non-GPU cards that need extra power, such as AJA KONA 5, Blackmagic DeckLink 8K Pro G2 and Avid Pro Tools | HDX. Check Sonnet's PCIe Card Compatibility PDF if you have a specific card in mind.

Q: Can I use it with Avid Pro Tools | HDX cards?

A: Yes. At the flick of a switch, the system is optimised to support three Pro Tools | HDX PCIe cards, with no extra parts necessary. It is qualified by Avid Audio Group for use with Avid Pro Tools 2026 software and Avid Pro Tools, Pro Tools HD and Pro Tools Ultimate systems.

Q: What does the second Thunderbolt port do, and can I add more expansion later?

A: The system has two Thunderbolt 5 ports. One connects to your computer, and the second connects an additional Thunderbolt or USB device and provides 15W to bus-powered devices. You can also connect one 5K display using spare bandwidth. The included Echo III T5 Module takes up half of the enclosure. The other half can hold an Echo II DV T5 Module, another Echo III T5 Module or an xMac mini (2024+) Module, all sold separately.

Part Number ECHO-3R-T5
Warranty 2-year
Customer Support Lifetime technical support
Form Factor Thunderbolt 5 rackmount expansion system (2U)
Interface Thunderbolt 5, two ports (one to the computer, one for an additional Thunderbolt or USB device)
Secondary Port Power 15W to bus-powered USB or Thunderbolt devices
PCIe Bandwidth 3400 MB/s aggregate, bi-directional, when connected to a Thunderbolt 5 computer port
Expansion Slots Three PCIe 3.1 slots: one x16 and two x8
PCIe Cards Supported Single- and double-width PCIe 4.0, 3.1, 2.0 and 1.1 non-GPU cards up to 12.28 inches long: three full-height, single-width cards, or one double-width card plus one single-width card
Power Supply Integrated 400W, with 75W auxiliary PCIe power connector
Cooling Dual temperature-controlled, variable-speed Noctua fans, rated at 17 dBA
Rack Mounting 2U, 16.5 inches deep, with adjustable extension rails for racks 16 to 24 inches deep
Dimensions (WxDxH) 19 x 16.5 x 3.6 in (48.3 x 41.9 x 9.1 cm)
Weight 23.15 lbs (10.50 kg)
Mac Compatibility Mac with Thunderbolt 5, Thunderbolt 4 or Thunderbolt/USB4 ports. macOS 15 or later; compatible with macOS 27
Windows Compatibility Windows computer with Thunderbolt 5, Thunderbolt 4 or USB4 ports. Windows 11 25H2 or later and Windows Server 2025
Linux Compatibility Linux computer with Thunderbolt 5, Thunderbolt 4 or USB4 ports. Supported Linux kernel 6.6 or later
Pro Tools Compatibility Avid Pro Tools | HDX compatible; qualified by Avid Audio Group for Avid Pro Tools 2026 software and Avid Pro Tools, Pro Tools HD and Pro Tools Ultimate systems
Included Cable 0.8-meter Thunderbolt 5 cable, fully compatible with Thunderbolt 5, 4 and 3 computers
PCIe Card Compatibility Non-GPU cards only. For a list of compatible PCIe cards, see this PDF document.

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