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OWC Mercury Helios 3 Thunderbolt 3 PCIe Expansion Chassis

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  • 1 x PCIe 3.0 x16/x4 Slot
  • 2 x Thunderbolt 3 Ports
  • 1 x Mini DisplayPort
  • Supports Half-Length Cards up to 7.75"

Thee OWC Mercury Helios 3 Thunderbolt 3 PCIe Expansion Chassis allows users connect PCIe expansion cards to their host system using Thunderbolt 3. Thunderbolt 3 provides bi-direction data transfer speeds of up to 40 Gb/s, which can drive peripherals made for video production, transcoding, audio processing, data storage, and more.

This enclosure has one PCIe 3.0 slot which runs at x4 but can accept cards up to x16. Supported form factors include half-height cards up to 7.75", as well as full-height and double-width cards. It interfaces with your host system using one Thunderbolt 3 port, while a second Thunderbolt 3 port can be used to daisy-chain an additional five compatible Thunderbolt 3 peripherals and deliver a minimum of 25W of power. Also supported is a dual-display configuration via Thunderbolt 3 and separate mini DisplayPort output. The Mercury Helios 3 can drive one display up to 4K at 60 Hz or two 1080p displays at 60 Hz.

Compatible systems include the Mac mini, MacBook Pro, iMac Pro, iMac, and MacBook Air running macOS 10.12.1 or later, as well as Intel/AMD-based systems running Windows 10 or later. Windows 10 is also supported under Boot Camp. Included is a 1.6' Thunderbolt 3 cable, an auto-switching power supply, and a power cable.


  • Daisy-chain support for up to five additional Thunderbolt peripherals
  • Near-silent operation
  • Plug-and-play - no drivers needed

Support for Most PCIe Cards

  • Fibre Channel
  • 10GbE Network Interface Controller
  • Video capture
  • Digital audio
  • Solid-state drives
  • SAS controllers, such as the OWC Jupiter
  • FireWire, USB 3.1 Gen (USB 3.0), or eSATA host adapter cards


Mac mini (Late 2018)


MacBook Pro (15" with Touch Bar, Late 2016)


MacBook Pro (13" with Touch Bar, Late 2016)


MacBook Pro (13" with Retina Display, Late 2016)


MacBook Pro (13" with Retina Display, Mid 2016)


MacBook Pro (13" with Touch Bar, Mid 2017)


MacBook Pro (15" with Touch Bar, Mid 2017)


MacBook Pro (13" with Touch Bar, Mid 2018)


MacBook Pro (15" with Touch Bar, Mid 2018)


iMac Pro (27", Late 2017)


iMac (21.5", Mid 2017)


iMac with Retina 4K Display (21.5", Mid 2017)


iMac with Retina 5K Display (27", Mid 2017)


MacBook Air (13", Late 2018)



Compatible with Intel- and AMD-based desktop/laptop systems with built-in Thunderbolt 3 ports
In the Box
OWC Mercury Helios 3 Thunderbolt 3 PCIe Expansion Chassis

Thunderbolt 3 Cable (1.6' / 0.5m)

Power Cable

Power Supply (12V / 7.5A)
More Information
Product ConditonNew
Expansion Slots 1 x PCIe 3.0 x4 (x16 mode)
Supported PCI Card Sizes Full-Height, Half-Length, Double-Width
Host Connection Thunderbolt 3
Ports 2 x USB Type-C Thunderbolt 3
1 x Mini DisplayPort
Operating System Support Windows, macOS/OS X
Power Source Type  External Adapter
AC Input Power 100 to 240 VAC, 50 / 60 Hz
Operating Temperature 32 to 95°F / 0 to 35°C
Storage Temperature -40 to 149°F / -40 to 65°C
Form Factor Desktop
Host Cable Length 1.64' / 0.5 m
Dimensions 5.28 x 3.23 x 9.65" / 134 x 82 x 245 mm
Weight 3.1 lb / 1.4 kg
WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer. For more information go to
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