




Sonnet Echo Express SEL (Thunderbolt 3 Edition)
Tax included.
The Power of PCIe, Unlocked for Laptops
The Sonnet Echo Express SEL (Thunderbolt 3 Edition) is the essential desktop expansion system for today’s ultra-portable, port-limited computers. Designed for professionals using Mac, Windows, or Linux systems with Thunderbolt 3 connectivity, this compact enclosure lets you connect a single low-profile PCIe card to your computer with one cable - bringing workstation-class performance to your laptop or all-in-one setup.
Blazing Thunderbolt 3 Performance
Built around the 40 Gbps Thunderbolt 3 interface, the Echo Express SEL delivers up to 2750 MB/s of PCIe bandwidth - double the speed of the previous Thunderbolt generation. This ensures your installed PCIe card operates at full speed, even under heavy workloads.
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- x8 PCIe 3.0 Slot: Supports one half-length (up to 6.6") low-profile, single-width card.
- Full-Speed Operation: Ideal for demanding high-bandwidth cards such as dual-port 10GbE adapters and 4K capture devices.
- Universal PCIe Support: Compatible with PCIe 1.1, 2.0, and 3.0 cards.
The SEL’s low-profile design accommodates the most popular Thunderbolt-compatible cards for high-speed networking, video, and storage - without wasted space or noise.
Smart, Silent, and EfficientEngineered for professional environments, the Echo Express SEL combines a rugged aluminium enclosure with intelligent cooling and power management.
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- Remarkably Quiet: A variable-speed, temperature-controlled fan automatically adjusts for silent operation - even during intense processing.
- Energy Saver Mode: Powers on and off automatically with your host computer, saving energy and eliminating the need for manual switching.
- Secure Connection: Includes a ThunderLok 3 retainer clip to prevent accidental cable disconnections - essential for mission-critical workflows.
Expand Your Workflow with Daisy-Chained Thunderbolt 3
The Echo Express SEL isn’t just a PCIe expansion—it’s a connectivity hub. Featuring dual Thunderbolt 3 ports, it provides flexibility for professional setups:
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- Daisy Chain: Connect up to five additional Thunderbolt devices from the second port.
- Display Ready: Drive two 4K displays (60Hz) or a single 5K display (60Hz) directly from the enclosure.
- Power for Peripherals: Provides 15 W of power to bus-powered devices through the daisy chain port.
- USB 3.1 Gen 2 Support: Fully compatible with 10 Gbps USB-C devices via appropriate adapters.
Main features:
- Desktop PCIe expansion for Thunderbolt 3 computers (Mac, Windows, and Linux).
- 40 Gbps Thunderbolt 3 interface delivering 2750 MB/s PCIe bandwidth.
- One PCIe 3.0 x8 slot for low-profile, half-length, single-width cards.
- Dual Thunderbolt 3 ports for daisy-chaining and display support.
- Variable-speed fan for quiet, temperature-controlled cooling.
- Energy Saver Mode automatically powers on/off with host system.
- Up to 15 W power delivery for bus-powered peripherals.
- Includes Thunderbolt 3 cable (0.7 m) and ThunderLok 3 retainer clip.
- Compact, rugged aluminium design—professional-grade reliability.
- Range: Echo Express
- Series: PCIe Card Expansion System
- Interface: Thunderbolt 3 (40 Gbps)
- PCIe Slot: 1 × PCIe 3.0 ×8
- Card Support: 1 × Low-profile, Half-length (6.6 inches), Single-width
- Ports: 2 × Thunderbolt 3
- Power: 15 W to connected peripherals
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Cooling: Variable-speed temperature-controlled fan
- Weight: 2.04 kg
- Box Contents: Echo Express SEL, Universal power adapter, Power cord, 0.7 m Thunderbolt 3 cable, ThunderLok 3 clip, Documentation
- Warranty: 24 months
- Discover Sonnet Technologies with PCIe Card Expansion Systems [Echo Express SEL T3]: https://www.sonnettech.com/product/echo-express-sel-tb3/overview.html




















