---
product_id: 159133997
title: "Sonnet Echo Express SEIIIe Thunderbolt 3 Edition (3-Slot PCIe Card Expansion Chassis)"
brand: "sonnet"
price: "€ 1521.61"
currency: EUR
in_stock: true
reviews_count: 7
category: "Sonnet"
url: https://www.desertcart.nl/products/159133997-sonnet-echo-express-seiiie-thunderbolt-3-edition-3-slot-pcie
store_origin: NL
region: Netherlands
---

# 40Gbps Thunderbolt 3 speed 2750 MB/s PCIe bandwidth 3 full-height PCIe 3.0 slots Sonnet Echo Express SEIIIe Thunderbolt 3 Edition (3-Slot PCIe Card Expansion Chassis)

**Brand:** sonnet
**Price:** € 1521.61
**Availability:** ✅ In Stock

## Summary

> ⚡ Unlock your Mac’s full potential with triple PCIe power — don’t get left behind!

## Quick Answers

- **What is this?** Sonnet Echo Express SEIIIe Thunderbolt 3 Edition (3-Slot PCIe Card Expansion Chassis) by sonnet
- **How much does it cost?** € 1521.61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/159133997-sonnet-echo-express-seiiie-thunderbolt-3-edition-3-slot-pcie)

## Best For

- sonnet enthusiasts

## Why This Product

- Trusted sonnet brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Simplicity:** Effortlessly connect multiple PCIe cards to any Thunderbolt 3 Mac with minimal setup and quiet, reliable cooling.
- • **Triple PCIe Powerhouse:** Expand your Mac’s capabilities with three full-height, half-length PCIe 3.0 slots for ultimate customization.
- • **Massive Bandwidth Boost:** 2750 MB/s PCIe bandwidth ensures your high-performance cards run at peak efficiency without bottlenecks.
- • **Future-Proof & Supported:** Backed by a 2-year warranty and free lifetime support since 1986, ensuring your investment stays protected.
- • **Blazing Thunderbolt 3 Interface:** Experience ultra-fast 40Gbps Thunderbolt 3 connectivity that doubles previous generation speeds for seamless data flow.

## Overview

The Sonnet Echo Express SEIIIe Thunderbolt 3 Edition is a sleek, aluminum 3-slot PCIe expansion chassis designed to connect up to three full-height, half-length PCIe 3.0 cards to any Mac with Thunderbolt 3 ports. Delivering a blazing 40Gbps Thunderbolt 3 interface and 2750 MB/s PCIe bandwidth, it doubles the performance of previous Thunderbolt generations. Ideal for professionals needing expanded graphics, capture, or I/O capabilities, it offers quiet cooling, plug-and-play ease, and is backed by a 2-year warranty with lifetime support.

## Description

Buy Sonnet Echo Express SEIIIe Thunderbolt 3 Edition (3-Slot PCIe Card Expansion Chassis): Graphics Cards - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Pretty cool enclosure to expand your laptop connectivity - I’ve been using this for the past couple of months now and I’m pretty happy with it. I spent the first couple of days doing some troubleshooting with it and after some google searching, I discovered that I didn’t have the latest thunderbolt drivers installed as I had previously thought (so make sure you do that and have the latest bios updates as well). After the driver update, everything was working smoothly...well, almost. The function I had the most trouble with was video capture using a PCIe HDMI capture card. The first one I tried was the Elgato HD60 pro, but had a very difficult time trying to capture an input signal. I tried using a similar card by SIIG, but saw identical results. After I did some reading up on the specs for HDMI and Thunderbolt 3, I came to the conclusion that there’s simply not enough bandwidth to accommodate the HDMI input signal, display port output signal and all USB devices when they're connected. Thunderbolt 3 is advertised to have 40Gbits of bandwidth which is theoretical, while the actual bandwidth is at 22Gbits. 8Gbits is given priority allocation to the first connected display which cuts your available bandwidth to 14Gbits to accommodate the rest of your devices. This might be doable with a video capture card using the HDMI 1.4 spec (which uses 14Gbits of bandwidth), but you’d be pushing your luck if you’re driving an external display while trying to record an incoming HD signal simultaneously. The HDMI 2.0 spec allows for bandwidth usage at 18Gbits which makes using a PCIe based video capture card impossible (unless no other devices were connected), so you’re better off using an enclosure you can dedicate a capture card to or get an external one that connects via USB 3. I went with an external one by Mirabox, which gave me the flexibility to use my pen display, audio interface and remaining USB devices while capturing an incoming HD signal. Would I recommend this enclosure? Yes, to anyone who is looking to assemble a custom Thunderbolt dock as I did.
Review: Great for adding outputs on iMacs with M1 chip. - After several problems running ProPresenter 7.8 with our old computer, our church recently upgraded from the 2015 iMac to the new 2021 iMac with the M1 processor. In order to send multiple signals out, the new M1 Mac Mini’s and M1 desktops are limited in outputs. So after lots of research, this chassis was recommended to pair with the Decklink Duo 2. Sonnet Expansion Chassis is so simple for installing other PCIE cards. Fans relatively quiet. I used the Decklink Duo 2, Blackmagic HDMI to SDI 3G converter, and USB PCIE. Now we can send signal to 3 different sources, plus other usb ports, etc. The only negative from when I bought this Expansion Chassis from desertcart, no power source was included. So read the listing as some come with this, others do not and I had to order another chord with enough wattage. Other than that, this has been working excellent! No issues since installing everything!

## Features

- Connects three pcie cards to any mac with thunderbolt 3 ports-use multiple high-performance pcie cards at the same time
- Three pcie 3.0 slots-supports three full-height, half-length+ (up to 7.75 inches long)
- 40gbps thunderbolt 3 interface-offers 2750 mb/s of pcie bandwidth, doubling the performance of thunderbolt 2
- Two thunderbolt 3 (usb-c) ports-one port reserved for connection to the computer
- See Computer Compatibility at Bottom of Page, Includes 2-year warranty and free lifetime customer support since 1986

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07XHP2D12 |
| Antenna Location | Gaming |
| Best Sellers Rank | #381 in Computer Graphics Cards |
| Brand | Sonnet |
| Case Type | Desktop |
| Color | Black |
| Compatible Devices | Personal Computer, Mackbook Pro, |
| Cooling Method | Air |
| Customer Reviews | 4.2 out of 5 stars 46 Reviews |
| Enclosure Material | Aluminum |
| Global Trade Identification Number | 00732311012938 |
| Hard Disk Form Factor | 3.5 Inches |
| Internal Bays Quantity | 3 |
| Item Height | 23 centimeters |
| Item Weight | 3 Kilograms |
| Manufacturer | Sonnet Technologies |
| Material | Aluminum |
| Model Name | SEIIIe |
| Motherboard Compatability | Extended ATX |
| Power Supply Mounting Type | External |
| Recommended Uses For Product | Gaming |
| Supported Motherboard | Extended ATX |
| UPC | 732311012938 |

## Product Details

- **Brand:** Sonnet
- **Motherboard Compatability:** Extended ATX
- **Case Type:** Desktop
- **Recommended Uses For Product:** Gaming
- **Color:** Black
- **Material:** Aluminum
- **Power Supply Mounting Type:** External
- **Cooling Method:** Air
- **Model Name:** SEIIIe
- **Item Weight:** 3 Kilograms

## Images

![Sonnet Echo Express SEIIIe Thunderbolt 3 Edition (3-Slot PCIe Card Expansion Chassis) - Image 1](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)

## Questions & Answers

**Q: If i used this for adaptec raid controller, will performance be the same as if installed on the server motherboard?**
A: We expect the Adaptec RAID controllers to have an adequate cache to support Thunderbolt performance that is similar to motherboard performance.

**Q: Is it possible to use it with pro tools hdn card and aja lhi,  with a new macstudio?**
A: Hello Michael, The ProTools HDX card does not fit in the Echo Express SEIIIe. You would need an Echo III, which supports the full-length HDX card and works with the M1 Macs.

**Q: Will this work with older server class sas/sata raid cards - specifically lsilogic sas9260 or other cards from that generation?**
A: You would have to ask the card maker whether their driver is Thunderbolt compatible, which usually means that the driver needs to gracefully handle hot plug/unplug. Drivers that cannot handle hot plug/unplug may still work if you plug/unplug the Thunderbolt chassis from the computer only when the computer is shut down.

**Q: Will this work on a Dell PC?**
A: Thunderbolt drivers are provided by Intel, so yes, it should work

## Customer Reviews

### ⭐⭐⭐⭐⭐ Pretty cool enclosure to expand your laptop connectivity
*by J***T on July 11, 2021*

I’ve been using this for the past couple of months now and I’m pretty happy with it. I spent the first couple of days doing some troubleshooting with it and after some google searching, I discovered that I didn’t have the latest thunderbolt drivers installed as I had previously thought (so make sure you do that and have the latest bios updates as well). After the driver update, everything was working smoothly...well, almost. The function I had the most trouble with was video capture using a PCIe HDMI capture card. The first one I tried was the Elgato HD60 pro, but had a very difficult time trying to capture an input signal. I tried using a similar card by SIIG, but saw identical results. After I did some reading up on the specs for HDMI and Thunderbolt 3, I came to the conclusion that there’s simply not enough bandwidth to accommodate the HDMI input signal, display port output signal and all USB devices when they're connected. Thunderbolt 3 is advertised to have 40Gbits of bandwidth which is theoretical, while the actual bandwidth is at 22Gbits. 8Gbits is given priority allocation to the first connected display which cuts your available bandwidth to 14Gbits to accommodate the rest of your devices. This might be doable with a video capture card using the HDMI 1.4 spec (which uses 14Gbits of bandwidth), but you’d be pushing your luck if you’re driving an external display while trying to record an incoming HD signal simultaneously. The HDMI 2.0 spec allows for bandwidth usage at 18Gbits which makes using a PCIe based video capture card impossible (unless no other devices were connected), so you’re better off using an enclosure you can dedicate a capture card to or get an external one that connects via USB 3. I went with an external one by Mirabox, which gave me the flexibility to use my pen display, audio interface and remaining USB devices while capturing an incoming HD signal. Would I recommend this enclosure? Yes, to anyone who is looking to assemble a custom Thunderbolt dock as I did.

### ⭐⭐⭐⭐⭐ Great for adding outputs on iMacs with M1 chip.
*by J***J on January 5, 2022*

After several problems running ProPresenter 7.8 with our old computer, our church recently upgraded from the 2015 iMac to the new 2021 iMac with the M1 processor. In order to send multiple signals out, the new M1 Mac Mini’s and M1 desktops are limited in outputs. So after lots of research, this chassis was recommended to pair with the Decklink Duo 2. Sonnet Expansion Chassis is so simple for installing other PCIE cards. Fans relatively quiet. I used the Decklink Duo 2, Blackmagic HDMI to SDI 3G converter, and USB PCIE. Now we can send signal to 3 different sources, plus other usb ports, etc. The only negative from when I bought this Expansion Chassis from Amazon, no power source was included. So read the listing as some come with this, others do not and I had to order another chord with enough wattage. Other than that, this has been working excellent! No issues since installing everything!

### ⭐⭐⭐⭐ A bit underpowered. (B not compatible with the BMD decklink 8k pro G2)
*by R***I on September 24, 2025*

I bought this a few months ago and unfortunately never really used it. My main reason in buying it was to use it with the Blackmagic Design DeckLink 8K Pro G2, which requires 30w of power. This unit does only 15w so it wasn't working. Even if you use the auxiliary power in the enclosure, it is not enough. Other the an that it looks like a great piece of tech. If anyone knows how I could inreaae the power, then that would be perfect!

## Frequently Bought Together

- Sonnet Echo Express SEIIIe Thunderbolt 3 Edition (3-Slot PCIe Card Expansion Chassis)
- Blackmagic Design DeckLink Duo 2 4ch SDI Playback and Capture Card BMD-BDLKDUO2
- Sonnet Presto Solo 10GBASE-T Ethernet 1-Port PCIe Card [Thunderbolt Compatible]

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-27*