Sonnet Thunderbolt Docks Buying Guide: Echo 13 vs Echo 20 vs Echo 21

Flexx Memory Buying Guide

Sonnet's Echo dock range covers everything from comprehensive Thunderbolt 4 workstation expansion to high-performance Thunderbolt 5 docks with integrated NVMe storage, 10Gb Ethernet and up to 140W laptop charging.

The models can look similar on paper, but they are designed around very different priorities. This guide explains the differences between the Echo 20 Thunderbolt 4, Echo 20 Thunderbolt 5 SecureDock, Echo 21 Thunderbolt 5 SuperDock and Echo 13 Thunderbolt 5 SSD Dock.

View Recommended Docks ↓

Which Sonnet Echo Dock Do You Need?

Start with your workflow rather than the number of ports. The biggest differences are whether you need Thunderbolt 5, 10Gb Ethernet and built-in NVMe storage — and how important SSD performance is to your setup.

Lots of connectivity + internal NVMe storage without needing Thunderbolt 5

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Echo 20 Thunderbolt 4 SuperDock

Thunderbolt 5 + 10GbE with no internal storage

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Echo 20 Thunderbolt 5 SecureDock

Maximum workstation connectivity + 10GbE + NVMe storage

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Echo 21 Thunderbolt 5 SuperDock

Thunderbolt 5 docking with an emphasis on very fast NVMe storage

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Echo 13 Thunderbolt 5 SSD Dock

Sonnet Echo 13, Echo 20 & Echo 21 Compared

Here are the key differences at a glance. Maximum performance and display support can vary depending on the host computer, operating system and connected devices.

Feature	Echo 20 TB4	Echo 20 TB5	Echo 21 TB5	Echo 13 TB5
Thunderbolt	Thunderbolt 4	Thunderbolt 5	Thunderbolt 5	Thunderbolt 5
Internal M.2 NVMe	Yes	No	Yes	Yes
Maximum Internal Storage	Up to 8TB	—	Up to 8TB	Up to 8TB
Internal SSD Performance	Up to 800MB/s	—	Up to approx. 3300MB/s	Up to 6600MB/s*
Ethernet	2.5GbE	10GbE	10GbE	2.5GbE
Laptop Charging	Up to 100W	Up to 140W	Up to 140W	Up to 140W
Dedicated HDMI	Yes	Yes	Yes	No
Dedicated DisplayPort	No	Yes	Yes	No
Primary Strength	Connectivity + storage	Secure TB5 workstation	Complete workstation	High-speed SSD storage

*Maximum SSD performance depends on the installed SSD, host computer and configuration.

Recommended Sonnet Thunderbolt Docks

Best for: Extensive connectivity + integrated storage without needing Thunderbolt 5

Sonnet Echo 20 Thunderbolt 4 SuperDock

The Echo 20 Thunderbolt 4 SuperDock remains a highly capable workstation dock for users who want extensive connectivity and the convenience of internal NVMe storage without needing Thunderbolt 5.

Its internal M.2 NVMe slot supports up to 8TB of storage, with transfer speeds up to approximately 800MB/s. That makes it particularly useful for documents, media libraries, general working storage and Time Machine backups rather than ultra-high-speed scratch storage.

Thunderbolt 4 connectivity
Internal M.2 NVMe SSD slot — up to 8TB
Up to 800MB/s internal SSD performance
2.5 Gigabit Ethernet
Eight 10Gbps USB ports
HDMI connectivity
Up to 100W laptop charging

Choose the Echo 20 TB4 if: you want a comprehensive dock with internal storage and don't need Thunderbolt 5, 10Gb Ethernet or 140W charging.

View Sonnet Echo 20 Thunderbolt 4 SuperDock →

Best for: Thunderbolt 5 workstations where onboard storage is not required

Sonnet Echo 20 Thunderbolt 5 SecureDock

Despite sharing the Echo 20 name, the Thunderbolt 5 SecureDock is not simply a faster replacement for the Echo 20 Thunderbolt 4. It is designed around a different requirement: high-performance workstation connectivity without internal storage.

It combines Thunderbolt 5 with built-in 10 Gigabit Ethernet, extensive 10Gbps USB connectivity, dedicated HDMI and DisplayPort connections and up to 140W laptop charging.

Thunderbolt 5 connectivity
No internal storage
10 Gigabit Ethernet with multi-gigabit support
HDMI and DisplayPort video outputs
Multiple 10Gbps USB-A and USB-C ports
UHS-II SD and microSD card readers
Up to 140W laptop charging

Choose the Echo 20 TB5 if: you need Thunderbolt 5, 10Gb networking and extensive workstation connectivity but don't need — or don't want — internal storage inside the dock.

View Sonnet Echo 20 Thunderbolt 5 SecureDock →

Best for: A complete Thunderbolt 5 workstation with 10GbE + NVMe storage

Sonnet Echo 21 Thunderbolt 5 SuperDock

The Echo 21 is the workstation-focused model in Sonnet's Thunderbolt 5 dock range. It combines high-speed networking, extensive peripheral connectivity, display connections and internal NVMe storage in a single dock.

Its internal M.2 NVMe slot supports up to 8TB of storage with performance around 3300MB/s, while built-in 10Gb Ethernet makes it particularly attractive for professional NAS, server and shared-storage workflows.

Thunderbolt 5 connectivity
Internal M.2 NVMe SSD slot — up to 8TB
Internal NVMe performance up to approximately 3300MB/s
10 Gigabit Ethernet
Extensive 10Gbps USB connectivity
Dedicated HDMI and DisplayPort connections
UHS-II SD and microSD card readers
Up to 140W laptop charging

Choose the Echo 21 if: you want the most comprehensive workstation-oriented Sonnet Thunderbolt 5 dock with both 10GbE and internal NVMe expansion.

View Sonnet Echo 21 Thunderbolt 5 SuperDock →

Best for: Thunderbolt 5 docking where high-speed NVMe storage is a priority

Sonnet Echo 13 Thunderbolt 5 SSD Dock

The Echo 13 takes a different approach. Instead of trying to provide every possible workstation connection, it places much greater emphasis on high-performance integrated NVMe storage.

Install a compatible M.2 NVMe SSD and the dock can deliver storage performance up to 6600MB/s on a suitable Thunderbolt 5 computer. It can be purchased with an empty M.2 slot for installing your own compatible SSD, or with pre-installed SSD storage for a ready-to-use solution.

Thunderbolt 5 connectivity
M.2 NVMe SSD slot supporting up to 8TB
Up to 6600MB/s with suitable SSD and Thunderbolt 5 host
Available with or without pre-installed SSD storage
Three downstream Thunderbolt ports
2.5 Gigabit Ethernet
SD and microSD card readers
Up to 140W laptop charging

Choose the Echo 13 if: you want your dock to double as genuinely high-performance NVMe working storage and don't require the Echo 21's built-in 10GbE and broader workstation connectivity.

View Sonnet Echo 13 Thunderbolt 5 SSD Dock →

Sonnet Echo 13 vs Echo 21: What's the Difference?

The Echo 13 and Echo 21 are likely to be the two models many Thunderbolt 5 users compare most closely because both combine docking with internal NVMe storage. The difference is what each product prioritises.

Choose Echo 13

Choose the Echo 13 when storage performance is the priority. Its internal NVMe implementation can deliver significantly higher storage speeds, making it particularly suitable for video editing, photography, large project files and other storage-intensive workflows.

Choose Echo 21

Choose the Echo 21 when workstation connectivity is the priority. You gain built-in 10Gb Ethernet, dedicated display connections and more extensive peripheral connectivity while still retaining fast internal NVMe storage.

Put simply: Echo 13 is the SSD-focused Thunderbolt 5 dock. Echo 21 is the workstation-focused Thunderbolt 5 dock with SSD expansion.

Echo 20 Thunderbolt 4 vs Echo 20 Thunderbolt 5

The shared Echo 20 name can make these docks appear to be two generations of the same product, but their design priorities are quite different.

Echo 20 Thunderbolt 4

Includes internal M.2 NVMe storage, 2.5Gb Ethernet and up to 100W laptop charging. It remains a strong choice when you want extensive connectivity and internal storage but don't need Thunderbolt 5.

Echo 20 Thunderbolt 5

Removes internal storage and instead focuses on Thunderbolt 5 workstation connectivity, 10Gb Ethernet, dedicated video outputs and up to 140W laptop charging.

Therefore, the Thunderbolt 4 model should not automatically be dismissed simply because a Thunderbolt 5 Echo 20 exists. The right model depends on whether integrated storage or newer high-bandwidth workstation connectivity matters more to your setup.

Which Sonnet Thunderbolt Dock Should You Choose?

Rather than choosing simply by model number, match the dock to what you actually need from your workstation.

Thunderbolt 4 + integrated storage Echo 20 Thunderbolt 4

Thunderbolt 5 + 10GbE without onboard storage Echo 20 Thunderbolt 5

Maximum Thunderbolt 5 workstation connectivity Echo 21 Thunderbolt 5

High-performance integrated NVMe storage Echo 13 Thunderbolt 5

Why Combine Docking and Storage?

For MacBook Pro and other laptop-based workstations, a dock can turn a portable computer into a complete desktop setup through a single cable. Displays, networking, external peripherals, card readers and power can remain connected to the dock while the computer can be disconnected whenever you need to leave.

Models such as the Echo 13, Echo 20 Thunderbolt 4 and Echo 21 take this further by integrating NVMe storage into the dock itself. This can reduce desktop clutter and provide immediately available storage whenever the computer is connected.

The important point is that not all integrated storage performs at the same speed. The Echo 20 Thunderbolt 4 is suitable for general storage and backup, the Echo 21 provides considerably faster working storage, while the Echo 13 is specifically designed around high-performance NVMe storage.

Why Buy Sonnet from Flexx Memory?

Specialist Advice

We specialise in Mac, Thunderbolt, storage and professional connectivity solutions and can help you choose the right dock for your actual workflow.

Compatibility Help

Thunderbolt dock capabilities can vary between Mac generations and processors. If you're unsure about displays, charging, networking or storage compatibility, ask us before ordering.

UK-Based Support

Flexx Memory is a UK specialist retailer supplying Sonnet products for individual, business and professional customers.

Sonnet Thunderbolt Dock FAQ

Which Sonnet dock has the fastest internal SSD?

The Echo 13 Thunderbolt 5 SSD Dock is the storage-focused model. With a suitable compatible NVMe SSD and Thunderbolt 5 host, storage performance can reach up to 6600MB/s. Actual performance depends on the SSD, computer and configuration.

Which Sonnet docks have 10Gb Ethernet?

The Echo 20 Thunderbolt 5 SecureDock and Echo 21 Thunderbolt 5 SuperDock include built-in 10 Gigabit Ethernet. The Echo 20 Thunderbolt 4 and Echo 13 Thunderbolt 5 use 2.5 Gigabit Ethernet.

Which Sonnet Thunderbolt 5 docks have an M.2 NVMe SSD slot?

The Echo 13 Thunderbolt 5 SSD Dock and Echo 21 Thunderbolt 5 SuperDock include internal M.2 NVMe storage expansion. The Echo 20 Thunderbolt 5 SecureDock does not include internal storage.

Can I install my own SSD in the Sonnet Echo 13?

Yes. The Echo 13 is available without an SSD so you can install your own compatible M.2 NVMe drive up to 8TB. Flexx also offers configurations with pre-installed SSD storage for customers who prefer a ready-to-use solution. Check current SSD compatibility before installing your own drive.

Do I need a Thunderbolt 5 Mac to use a Thunderbolt 5 Sonnet dock?

Not necessarily. Compatibility depends on the individual dock and host computer, and some models can operate with compatible Thunderbolt 4, Thunderbolt 3 or USB4 systems. However, maximum Thunderbolt 5 bandwidth, SSD performance and display capabilities require an appropriate host. Always check compatibility for your specific Mac or PC.

Which Sonnet dock should I consider for a MacBook Pro workstation?

It depends on the workflow. The Echo 21 is designed around extensive workstation connectivity, 10GbE and NVMe expansion. The Echo 13 prioritises high-speed integrated SSD storage. The Echo 20 Thunderbolt 5 is useful where onboard storage isn't required, while the Echo 20 Thunderbolt 4 remains a strong option where Thunderbolt 5 isn't necessary.

Is the Echo 20 Thunderbolt 4 still worth considering?

Yes. Thunderbolt 5 is newer and provides greater bandwidth, but not every workflow requires it. If your computer uses Thunderbolt 4 or your priority is extensive connectivity with convenient internal NVMe storage, the Echo 20 Thunderbolt 4 remains a practical option.