# PCIe adapter Sonnet Echo Express SEL Thunderbolt 3 host interface, PCIe x4 card expansion, PCI 3.0, black

**URL:** https://aio.lv/en/product--sonnet-echo-exp-sel-t3--4977696
**Data updated:** 2026-03-07 15:09 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** Sonnet
**Manufacturer code:** ECHO-EXP-SEL-T3
**EAN:** 732311012044
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 522.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 432.22 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sonnet-echo-exp-sel-t3--4977696

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

Sonnet Echo Express SEL is a compact PCIe adapter that connects to a host via Thunderbolt 3 and provides an external PCIe (PCI 3.0) expansion slot for add-in cards. It supports common desktop expansion cards and is compatible with macOS 10.12–10.14 and various Windows 10 editions. Includes AC and Thunderbolt cables; dimensions 103×210×72.8 mm.

## Long description

Sonnet Echo Express SEL (Thunderbolt 3 Edition) is a compact external PCIe adapter that connects to a host computer via Thunderbolt 3 and provides a single low-profile PCIe x8 slot (PCI Express 3.0) for add-in cards. The black aluminum chassis houses a variable-speed, temperature-controlled fan and supports common desktop expansion cards for networking, storage controllers, video capture and processing, and other PCIe devices. The unit includes a Thunderbolt 3 cable and mounting retainer and is compatible with macOS 10.12–10.14 and a range of Windows 10 editions. Its small footprint makes it suitable for systems without internal expansion slots while delivering up to PCIe bandwidth necessary for high-performance cards.
Advantages
The Echo Express SEL uses Thunderbolt 3 (40 Gbps) to deliver high PCIe bandwidth sufficient for many 4K video capture and processing cards, dual-port 10Gb Ethernet adapters, and 16 Gb Fibre Channel cards. Its compact aluminum body provides durable protection for the installed card and the fan control maintains reliable thermal performance with low acoustic output. Two Thunderbolt 3 ports support host connection and daisy-chaining of additional Thunderbolt peripherals, and the device supplies up to 15 watts to bus-powered devices connected to the downstream port. A short Thunderbolt 3 cable and a ThunderLok retainer clip are included to secure the connection and reduce the risk of accidental disconnection.
Suitable for
Connecting a low-profile PCIe card to thin notebooks, small form factor, or all-in-one computers
High-speed networking cards such as 10GbE and 40GbE adapters
Fibre Channel host bus adapters and high-performance storage controllers
Video capture, processing and I/O cards used for 4K/5K workflows
SAS/SATA host adapters and RAID controller cards for external storage
Key specifications
External interface: Thunderbolt 3 (two ports; 40 Gbps)
PCIe slot: single low-profile x8 physical slot, PCI Express 3.0 signaling
Maximum practical PCIe bandwidth: up to approx. 2750 MB/s of host PCIe bandwidth over Thunderbolt 3
Chassis material: aluminum with internal airflow path
Cooling: variable-speed, temperature-controlled fan for quiet operation
Power: internal power supply; provides up to 15 W on downstream Thunderbolt port for bus-powered devices
Included accessories: 0.5 m Thunderbolt 3 cable and cable retainer (ThunderLok)
Dimensions: 103 × 210 × 72.8 mm
How to use
Install a compatible low-profile PCIe card into the Echo Express SEL slot following the manufacturer’s orientation and fastening instructions. Connect the included Thunderbolt 3 cable from the SEL’s host Thunderbolt port to a Thunderbolt 3 port on your computer; if required, attach the ThunderLok retainer clip to secure the cable. Power the unit from its AC adapter; the device powers on and off automatically with the computer. If needed, connect additional Thunderbolt peripherals to the second downstream Thunderbolt 3 port. Confirm driver support and OS compatibility for the installed PCIe card on the host operating system before use.
Usage recommendations
The Echo Express SEL is intended for use with Thunderbolt 3-equipped computers and compatible PCIe cards. For optimal performance, use PCIe 3.0 low-profile cards designed for single-slot external installation, keep ventilation unobstructed, and ensure the host operating system has the latest drivers for the installed card. Secure the Thunderbolt cable with the included ThunderLok to reduce the chance of accidental disconnects during data transfers.

## Specifications

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | 0 - 35 |

### Technical details

| Feature | Value |
|---|---|
| Sustainability certificates | RoHS |

### Ports & interfaces

| Feature | Value |
|---|---|
| Host interface | Thunderbolt 3 |
| Output interface | PCIe |
| Expansion card standard | PCI 3.0 |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.84 kg |
| Height | 72.8 mm |
| Width | 103 mm |
| Depth | 210 mm |

### System requirements

| Feature | Value |
|---|---|
| Windows operating systems supported | Windows 10 Pro, Windows 10 x64, Windows 10 Pro x64, Windows 10 IOT Core, Windows 10 Home x64, Windows 10 Home, Windows 10 Enterprise x64, Windows 10 Enterprise, Windows 10 Education x64, Windows 10 Education, Windows 10 |
| Mac operating systems supported | Mac OS X 10.14 Mojave, Mac OS X 10.13 High Sierra, Mac OS X 10.12 Sierra |

### Design

| Feature | Value |
|---|---|
| Internal | No |
| Product colour | Black |

### Packaging data

| Feature | Value |
|---|---|
| Cables included | AC, Thunderbolt |
| User guide | Yes |

## FAQ

### How much does the Sonnet Echo Express SEL PCIe Thunderbolt 3 adapter cost, and is it available for purchase?

The price is 522.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 06.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Sonnet Echo Express SEL PCIe Thunderbolt 3 adapter be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Sonnet products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Sonnet service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: host interface, weight, internal, output interface, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/4977696/59226200_large.webp