Echo Express SE I - Compact Desktop Thunderbolt Expansion System for One PCIe Card (Plus a Daughter Card)
Low-profile. Pro Performance.

Echo Express SEL

Compact, Desktop 1-slot Thunderbolt to PCIe Card Expansion System for Computers with Thunderbolt 4 or Thunderbolt 3 Ports

Connect a Low-profile PCIe Card

The latest ultra-light notebooks, small form factor, and all-in-one Mac®, Windows®, and Linux® computers with Thunderbolt™ 4 or Thunderbolt 3 ports are amazingly thin, but there’s nowhere to install PCIe cards. What if you want to add video capture, processing, or connecting capabilities to your computer? Sonnet has the answer–the Echo™ Express SEL is a compact, desktop Thunderbolt™ to PCIe card expansion system that enables you to connect a low-profile PCIe card to your computer via a single Thunderbolt cable.

Echo Express SEL with MacBook Pro
PCIe Card Connected to Thunderbolt Computer

The Thunderbolt Connection

Plugged into one of your computer's Thunderbolt 4 or Thunderbolt 3 ports, this little expansion system supports many low-profile PCIe cards (Thunderbolt-compatible 16Gb and 8Gb Fibre Channel, 25Gb and 10Gb Ethernet, video capture and processing, SAS and SATA host bus adapters, and RAID controllers) through its x8 PCIe 3.0 slot.

Why Thunderbolt 3 Instead of Thunderbolt 4?
Sonnet's Thunderbolt to PCIe card expansion systems rely on Thunderbolt 3 technology for maximum performance. Learn Why ›

Key Features

PCIe Card Icon

Connects a PCIe Card

Use high-performance PCIe cards with any computer with a Thunderbolt 4 or Thunderbolt 3 port.

Number 1 Icon

One PCIe 3.0 x8 Slot

Supports one low-profile PCIe card.

40Gbps Icon

40Gbps Thunderbolt 3 System

Offers 2750 MB/s of PCIe bandwidth to the installed card. Learn more about Thunderbolt 3 performance benefits over Thunderbolt 4.

Performance Icon

Small Package. Full Performance.

Smallest Thunderbolt to PCIe card expansion system available; supports the most popular low-profile, Thunderbolt-compatible PCIe cards at full performance.

Thunderbolt 3 Ports Icon

Two Thunderbolt Ports

One port connects to computer; second port supports daisy-chaining of up to five additional Thunderbolt peripheral devices.

Sound Icon

Remarkably Quiet

Temperature-controlled, variable-speed fan automatically and quietly cools the card.

Energy Saver Icon

Energy Saver Mode

Powers on/off automatically with the computer.

Rugged Icon

Rugged Aluminum Housing

Provides robust and secure protection.

Power Icon

Power for Peripherals

Daisy chain port provides up to 15W of power to connected peripherals.

Free Lifetime Tech Support
Low-profile PCIe Cards

Nearly Every Thunderbolt-compatible, Low-profile PCIe Card Supported

The Echo Express SEL accommodates a wide variety of PCIe cards. Do you have a card in mind but aren’t sure it’s compatible? We’ve put together a list in our supporting PCIe Card Thunderbolt Compatibility Chart (PDF). There you’ll find cards identified as conforming to Thunderbolt technology requirements, and organized by fit and power compatibility with specific expansion system.

Echo Express SEL Icon

Smart Design, Inside and Out

Aluminum Enclosure. Auto Power On/Off.

With a shell crafted of rugged and lightweight aluminum, Echo Express SEL securely houses the installed PCIe card. Inside, the card is protected through the use of a variable-speed, temperature-controlled fan which ensures the card and chassis’ components remain reliably cool. The fan automatically speeds up as necessary to cool the card when it’s hot, and slows down when it’s cool. Since Echo Express products automatically power on and off with your computer, there is no power switch on the chassis, ensuring you don’t waste energy by forgetting to turn it off.

Designed for Low-profile PCIe Cards

Echo Express SEL supports one half-length (up to 6.6 inches long), low-profile, single-width PCIe card; PCIe 1.1, PCIe 2.0, and PCIe 3.0 cards are supported. Many of the most popular Thunderbolt-compatible high-speed networking and storage controller cards are a perfect fit, and even the BlueFish 444 Epoch 4K Neutron video card can be accommodated.

Echo Express SEL PCIe Card Size Support
Echo Express SEL Interior View

1. PCIe 3.0 x8 slot

Fan Icon

Quiet Please

Echo Express SEL is designed to be ultra-quiet so that it can be comfortably used in noise-sensitive environments. The airflow path within the chassis has been specially designed to enable the fan to quietly and efficiently cool the installed card at all times, even during peak operation.
All the Right Connections

40Gbps Thunderbolt Cable and ThunderLok 3 Included

Sonnet includes a 0.7-meter Thunderbolt 3 cable that supports Thunderbolt's full 40Gbps bandwidth, and is fully compatible with Thunderbolt 4 computers. Sonnet also provides a ThunderLok™ 3 Thunderbolt connector retainer clip(1) that prevents accidental cable disconnections—just slide it over one end of the cable, and then plug in the connector and secure it to the chassis by turning a thumbscrew. Because of its unique design, ThunderLok remains on the cable so it won’t get lost when not in use.
40Gbps Thunderbolt Cable with ThunderLok 3Supports Full 2750 MB/s PCIe Bandwidth Icon

40Gbps Thunderbolt

Fastest External Interface Available

The Echo Express SEL features a 40Gbps Thunderbolt interface(2)(3) that delivers up to 2750 MB/s of PCIe bandwidth, enabling it to support 4K video capture and processing cards at high frame rates, and 16Gb FC cards and dual-port 10GbE cards at full performance.

Thunderbolt 40Gbps Ports Icons
Dual 40Gbps Thunderbolt Ports
One port is reserved for the connection to your Thunderbolt 4 or Thunderbolt 3 computer; the second port enables expansion of up to five additional Thunderbolt peripheral devices in a daisy chain.
10Gbps USB 3.1 Gen 2 Icon
10Gbps USB 3.2 Gen 2 Support
10Gbps USB 3.2 Gen 2 support allows you to connect a USB device(4) to the second port using the proper cable or adapter.
15W Power Icon
Provides 15W of Power
For peripherals requiring the need for extra power, 15 watts is provided to bus-powered devices.
4K & 5K Display Icon
Supports Connecting One 5K 60Hz Display
Maximize the utilization of one computer Thunderbolt port.
Thunderbolt 4 Computers

Forward Compatible with Thunderbolt 4 Computers

The Echo Express SEL is fully compatible with Thunderbolt 4 computers and was purposely designed with a Thunderbolt 3 controller and its four lanes of PCIe (not available in a Thunderbolt 4 peripheral) to achieve maximum performance. Learn more about the performance benefits of Thunderbolt 3 over Thunderbolt 4.

Apple M1 Logo

also compatible with M1 Macs

see tech specs for details

Older Macs with Thunderbolt 2 Ports

Backward Compatible with Older Macs

No Thunderbolt 3? No problem—the Echo III Desktop is also compatible with Macs with Thunderbolt 2 ports when used with the bi-directional Apple® Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter and a Thunderbolt cable (both sold separately).

Learn why Sonnet's Pro Products Rely on Thunderbolt 3 Technology for Maximum Performance
See Tech Specs for footnotes.
Product specifications and information subject to change without notice. Computer hardware and accessories featured in photos that are not included with product are shown for illustration purposes; items sold separately.

Echo Express SEL