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OWC Mercury Helios Thunderbolt 2 Single Slot Expansion Chassis For PCIe Cards with Dual Thunderbolt 20Gb/s Ports.

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This product is discontinued

Product code: OWCHELIOS1TB2



1M High Quality Thunderbolt 2 Cable Included. 3 Year OWC Limited Warranty. (HELIOS1TB2)
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OWC Mercury Helios

PCIe Thunderbolt Expansion Chassis

Thunderbolt / Thunderbolt 2 / Mac / PC
  • Features an x16 PCIe 2.0 double width card slot*.
  • Daisy-chain support for up to five additional Thunderbolt peripherals
  • Near-silent operation
  • Plug and Play - no drivers needed.**
Tap Into the Power of PCIe and Thunderbolt 2
The OWC Mercury Helios PCIe expansion chassis gives users of Thunderbolt equipped Macs the ability to tap into a huge variety of pro-level performance PCIe cards, previously the sole domain of desktop workstations. Helios utilizes Thunderbolt 2 and PCIe 2.0 to deliver nearly unlimited expansion potential to your Mac. Get empowered with the flexibility to upgrade the capabilities of almost any workflow or workstation.
Expansion Comes Standard
Helios features one half-length (up to 7.75"), full-height, double-width x16 PCIe 2.0 slot to provide a vast array of expansion options. And two Thunderbolt 2 ports means that Helios will support up to an additional five daisy-chained Thunderbolt peripherals.

Helios is fast and flexible with phenomenal throughput up to 20Gb/s. The perfectly simple solution to add high-performance PCIe cards made for video production, transcoding, audio processing, data storage and much more. Finally the functionality and productivity gains of these PCIe cards are easily accessible through your ThunderBolt connection.

Helios supports a huge variety of PCIe cards, including:
  • Fibre Channel.
  • 10GbE Network Interface Controller.
  • Video capture.
  • Digital audio.
  • Solid State Drive.
  • SAS controllers such as the OWC Jupiter.
  • FireWire, USB 3.0, or eSATA host adapter cards.
Other Outstanding Features:
  • Automatically powers on/off with your computer.
  • Hot-pluggable - no need to power off to connect and disconnect devices.***
  • Bus-power support for one Thunderbolt device.****
  • Rugged yet lightweight aluminum housing goes anywhere your work takes you.
* Thunderbolt limits PCIe x8 and x16 cards to x4 data lanes.
** Thunderbolt-aware drivers may be needed for PCIe card.
*** If any devices are connected to the PCIe card, make sure to properly remove them before disconnecting Helios.
**** Thunderbolt bus-powered device must be the last device on the chain.


  • OWC Mercury Helios PCIe Thunderbolt Expansion Chassis
  • High-Quality, Certified, Double-Shielded 1 Meter Thunderbolt cable
  • External auto-switching 100/240v 50/60Hz power adapter 12V/10A
  • Helios Manual (View PDF 2.2MB)
  • OWC 3 Year Solution Warranty



Product Specifications:

System Requirements

  • Software
    • OS
      • OS X 10.9 or later
      • Windows 7 SP1 or later
      • Note: Boot Camp is not supported
    • Driver
      • Driver not required
  • Hardware
    • Minimum Requirements
      • Mac or PC featuring Thunderbolt interface
    • Recommended (Best performance)
      • Mac or PC featuring Thunderbolt 2 interface
  • Bootability
    • OS X (requires installed PCIe card be bootable)


  • (2) Thunderbolt 20Gb/s

Device Interface

  • PCIe (PCI Express)

PCIe Card Support

  • (1) PCIe 2.0 x16 (x4 mode) half-length (up to 7.75"), full-height, single- or double-width
  • Note: PCIe card must operate with no driver or have a Thunderbolt-aware driver. Please see the OWC PCIe Thunderbolt card compatibility chart for more information.


  • Thunderbolt 2 - 20Gb/sec
  • Note: Speeds will vary based on setup, configuration, and other environmental factors


  • PCIe card minimum guaranteed power
    • 25W (slot)
  • Power Supply
    • External UL-listed, universal auto-switching
    • AC input: 100 ~ 240V, 2.0A, 50-60Hz
    • DC output: 12V, 10A

Product Manual


  • Height: 2.9 in (7.4 cm)
  • Width: 5.7 in (11.5 cm)
  • Length: 9.2 in (23.4 cm)


  • 3.9 lb. (1.8 kg)

Operating Environment:

Environmental (Operating)

  • Temperature (°F) 32° to 95°
  • Temperature (°C) 0° to 35°

Environmental (Non-Operating)

  • Temperature (°F) -40° to 149°
  • Temperature (°C) -40° to 65°


3 Year OWC Helios Limited Warranty

The best warranty is one you never have to use, but should the need occur, we're proud to provide a superior level of support and service coverage to our customers. 

  1. Windows requires a Thunderbolt 2 interface in the computer and in the expansion chassis to support more than two PCIe controllers. Note that some PCIe cards have a bridge to multiple controllers, so it is possible for a single dual-controller PCIe card to reach the limit if not connected via Thunderbolt 2. Not all Mac-compatible PCIe cards are also compatible with Windows. See the PCIe Card Thunderbolt Compatibility Chart for details.


Additional Information

Colour Black
Type No
Connection Thunderbolt 1 (10Gb/s), Thunderbolt 2 (20Gb/s)
Interface PCI
Form Factor No
Suitable for No
Model Identifier No
Manufacturer OWC
Manufacturer P/N OWCHELIOS1TB2

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Macfixit Australia is an Australian owned and operated business based in Melbourne, Victoria and we've been operating since 2005.

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