# PCIe Interface Card OWC Mercury Helios 3S

**URL:** https://aio.lv/en/product--owc-owchelios3s--3773112
**Data updated:** 2025-12-29 13:47 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** OWC
**Manufacturer code:** OWCHELIOS3S
**EAN:** 0810586032773
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 324.49 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 268.17 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--owc-owchelios3s--3773112

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.07.2026 | free |
| Pickup points | 27.07.2026 | 1.99 EUR |
| Courier delivery to door | 27.07.2026 | 4.99 EUR |

## Summary description

The OWC Mercury Helios 3S is a PCIe interface card designed for Thunderbolt 3 connectivity. It supports full-height and half-length expansion cards, with active cooling and a power consumption of 150W. Compatible with Windows 10 and Mac OS X 10.13 to 10.15.3, it provides a reliable solution for high-performance applications. Dimensions: 143mm x 233mm x 82mm.

## Long description

The OWC Mercury Helios 3S is an external PCIe enclosure that connects to Thunderbolt 3-equipped computers to provide a single, full-featured PCIe slot. It supports full-height and half-length expansion cards and delivers active cooling and up to 150W power to installed cards. The enclosure is compatible with Windows 10 and macOS 10.13–10.15.3 and measures 143 mm × 233 mm × 82 mm, making it suitable for adding professional video capture, audio processing, storage, or high-speed networking to laptops and compact desktops that lack internal PCIe slots.
Advantages
Mercury Helios 3S adds a standard PCIe slot via Thunderbolt 3, enabling use of pro-level PCIe cards with space-constrained systems. It supports a broad range of half-length and full-height single- or double-width cards, provides active cooling and up to 150W of card power, and offers dual 40 Gbps Thunderbolt 3 connectivity with backward compatibility. The unit is plug-and-play with no special drivers required for typical workflows and allows daisy-chaining of additional Thunderbolt peripherals while supplying up to 85W notebook charging.
Suitable for
Video capture and streaming with PCIe capture cards
Professional audio processing with PCIe audio interfaces and DSP cards
High-performance external storage using PCIe SSD or RAID controllers
High-speed networking with 10GbE/40GbE adapters
Workflows requiring multiple plug-ins, transcoding, or live streaming
Key specifications
Interface: Thunderbolt 3 (dual 40Gbps, Thunderbolt 2 backward compatible)
Supported cards: half-length/full-height, single or double width PCIe cards
Power delivery: up to 150W to PCIe card; 85W notebook charging via Thunderbolt
Cooling: active cooling system
Compatibility: Windows 10; macOS 10.13–10.15.3
Dimensions: 143 mm × 233 mm × 82 mm
Manufacturer part number (MPN): OWCHELIOS3S; EAN: 0810586032773
How to use
Remove the two thumb screws on the enclosure, insert a compatible PCIe card into the internal slot, secure the card and replace the thumb screws. Connect the Mercury Helios 3S to a Thunderbolt 3 port on your computer with the included Thunderbolt cable. The device is recognized automatically in supported operating systems; install any vendor drivers required by the specific PCIe card. Optionally daisy-chain additional Thunderbolt peripherals or connect a DisplayPort monitor and charge a compatible notebook from the enclosure.
Usage recommendations
For best results, use cards that meet the supported physical dimensions (half-length or full-height) and power limits. Ensure your host system runs a compatible OS version, and verify vendor drivers for specialized cards (video capture, audio interfaces, network adapters) are up to date. Allow airflow around the enclosure for effective cooling during sustained high-performance use.

## Specifications

### Technical details

| Feature | Value |
|---|---|
| Compliance certificates | RoHS |

### Ports & interfaces

| Feature | Value |
|---|---|
| Host interface | Thunderbolt 3 |
| Output interface | PCIe |
| Thunderbolt 3 ports quantity | 2 |
| Expansion card standard | PCI 3.0 |
| Expansion card form factor | Full-height / Half-length |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 1.6 kg |
| Height | 82 mm |
| Width | 143 mm |
| Depth | 233 mm |

### Power

| Feature | Value |
|---|---|
| Power consumption (typical) | 150 W |
| Power supply input voltage | 100 - 240 |
| Power supply input frequency | 50-60 |
| Output voltage | 12 |
| Output current | 12.5 A |

### System requirements

| Feature | Value |
|---|---|
| Windows operating systems supported | Windows 10 |
| Mac operating systems supported | Mac OS X 10.13 High Sierra, Mac OS X 10.14 Mojave, Mac OS X 10.15 Catalina, Mac OS X 10.15.3 Catalina |

### Design

| Feature | Value |
|---|---|
| Internal | No |
| Product colour | Black |
| Purpose | PC |
| Number of fans | 1 fan(s) |
| Cooling type | Active |

### Features

| Feature | Value |
|---|---|
| Plug and Play | Yes |

## FAQ

### How much does the PCIe Interface Card OWC Mercury Helios 3S cost, and is it available for purchase?

The price is 324.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 9 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 22.07.2026 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. All transactions are 100% secure and encrypted.

### 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 OWC 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 OWC 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/3773112/64227569_large.webp