---
product_id: 268720688
title: "OWC Mercury Helios 3S Thunderbolt 3 (40Gb/s) Single Slot PCIe Card Expansion Solution"
brand: "owc"
price: "€ 617.10"
currency: EUR
in_stock: true
category: "Owc"
url: https://www.desertcart.gr/products/268720688-owc-mercury-helios-3s-thunderbolt-3-40gb-s-single-slot
store_origin: GR
region: Greece
---

# 40Gb/s Thunderbolt 3 speed 2x Thunderbolt USB-C ports Supports 8K DisplayPort 1.4 OWC Mercury Helios 3S Thunderbolt 3 (40Gb/s) Single Slot PCIe Card Expansion Solution

**Brand:** owc
**Price:** € 617.10
**Availability:** ✅ In Stock

## Summary

> ⚡ Unlock next-level speed and power with OWC Mercury Helios 3S — because your setup deserves the best.

## Quick Answers

- **What is this?** OWC Mercury Helios 3S Thunderbolt 3 (40Gb/s) Single Slot PCIe Card Expansion Solution by owc
- **How much does it cost?** € 617.10 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/268720688-owc-mercury-helios-3s-thunderbolt-3-40gb-s-single-slot)

## Best For

- owc enthusiasts

## Why This Product

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

## Key Features

- • **8K Display Ready:** Connect stunning 8K displays via DisplayPort 1.4 and elevate your visual workspace.
- • **Daisy-Chain Like a Pro:** Link up to 5 additional Thunderbolt devices seamlessly for ultimate expansion.
- • **Power Through Your Day:** Charge your notebook with a robust 85W power delivery while you work—no downtime.
- • **Dual Thunderbolt USB-C Ports:** Expand your connectivity with two versatile, high-speed ports for all your devices.
- • **Blazing 40Gb/s Thunderbolt 3 Transfer:** Experience ultra-fast data flow that keeps your workflow lightning quick.

## Overview

The OWC Mercury Helios 3S is a premium Thunderbolt 3 PCIe expansion card delivering blazing 40Gb/s transfer speeds, dual Thunderbolt USB-C ports, and DisplayPort 1.4 support for up to 8K displays. Designed for professionals needing high-performance external PCIe slots, it offers 85W notebook charging, a secure locking power connector, and the ability to daisy-chain up to 5 Thunderbolt devices, making it the ultimate productivity booster for Mac and Windows users.

## Description

Mercury Helios 3S The powerful expansion solution that adds an external PCIe slot to your Thunderbolt 3 equipped laptop, space-constrained Mac, or Windows PC desktop.

## Features

- Lightning-fast 40Gb/s transfer speeds: (2) Thunderbolt (USB-C) ports
- See more: DisplayPort 1.4 for connecting up to an 8K display
- Charge while working: 85W of notebook charging
- Secure workflow: locking 12V power connector
- Maximum potential: daisy-chain up to 5 additional Thunderbolt devices

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B083V3DKCN |
| Best Sellers Rank | 33,864 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 311 in Computer Cases |
| Brand Name | OWC |
| Colour | Black |
| Compatible Devices | Laptops, Personal Computer |
| Country of Origin | Taiwan |
| Customer Reviews | 4.4 4.4 out of 5 stars (74) |
| Data Transfer Rate | 40 Gigabits Per Second |
| Enclosure Material | Metal |
| Hardware Interface | Thunderbolt |
| Item Dimensions L x W x H | 14.3L x 14.3W x 8.2H centimetres |
| Item Weight | 1.7 Kilograms |
| Manufacturer | OWC |
| Manufacturer Part Number | HELIOS3S |
| Minimum Required Operating System Version | Mac OS 14 Sonoma, Windows 11 |
| Model Number | OWCHELIOS3S |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Ports | 3 |
| Operating System | Windows, macOS |
| Product Features | Play, Plug |
| Product Warranty | 2 year manufacturer |
| Total USB Ports | 2 |
| UPC | 810586032773 |

## Product Details

- **Brand:** OWC
- **Colour:** Black
- **Compatible devices:** Laptops, Personal Computer
- **Hardware interface:** Thunderbolt
- **Special feature:** Play, Plug

## Images

![OWC Mercury Helios 3S Thunderbolt 3 (40Gb/s) Single Slot PCIe Card Expansion Solution - Image 1](https://m.media-amazon.com/images/I/51qnp1z4rRL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Does it support daisy chaining another Thunderbolt 3 device to the 2nd port? e.g. A 10gbe Thunderbolt network adapter.**
A: Hello. Yes, the OWC Mercury Helios 3S will allow or thunderbolt device to be daisy-chained off the second port of this chassis.

**Q: Can you install a gpu card like nvidia into this?**
A: Hello. No this unit does not support GPU's.

**Q: is this thunderbolt 4 compatible?**
A: Hello. This Mercury Helios 3S is a Thunderbolt 3 device, but can be used in a Thunderbolt 4 port as 3 is backwards compatible.

**Q: Will this work with bootcamp windows 10/11 for a lynx aes16e interface card?**
A: I bought this for my vive wireless pcie wigic card and just googled yours. From what I see so long as you have a thunderbolt 3 port it should work.vyour card should fit. However from the looks of the googled image you may have to keep the casing off. No loss it will still work just no shell.

## Frequently Bought Together

- OWC Mercury Helios 3S Thunderbolt 3 PCIe Expansion Solution
- Cable Matters [Intel Certified] 40Gbps Thunderbolt 4 Cable 3.3ft with 8K Video and 240W Charging - 1m, Compatible with USB4, Thunderbolt 3 Cable and USB-C

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.gr/products/268720688-owc-mercury-helios-3s-thunderbolt-3-40gb-s-single-slot](https://www.desertcart.gr/products/268720688-owc-mercury-helios-3s-thunderbolt-3-40gb-s-single-slot)

---

*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-09-29*