ExpressBox 3T-V3

(3) Slot Thunderbolt™ 3 PCIe Expansion

Make your workstation mobile, and take your PCIe cards anywhere. The ExpressBox 3T-V3 can transform both computers and laptops, with Thunderbolt™ 3 connection, into powerful workstations.

ExpressBox 3T-V3 provides an ‘outside-the-box’ solution for using PCIe cards with Thunderbolt™ 3-equipped computers. High-performance work flows are possible by connecting a Thunderbolt 3-equipped computer to a Thunderbolt™ 3 expansion chassis containing PCIe cards such as video capture, media transcoding, audio processing, and fast data storage. And because Thunderbolt™ 3 is also based on DisplayPort technology, you can daisy chain a high-resolution display with your Magma ExpressBox 3T-V3.


  • Supports (3) full-length PCI Express cards
  • Attach PCIe cards to Thunderbolt™ 3-enabled computer
  • Extension of PCI Express signals outside the computer
  • Daisy-chain or end-point device
  • Thunderbolt™ 3 features speeds up to 40Gbps



  • Easy Plug and Play installation
  • Use any combination of x1, x4, x8 and x16 PCIe cards
  • Hot-swappable cooling fan
  • Additional blower fan for extra hot cards
  • Works with Mac OS X 11.12 or higher
  • 300W power supply with (2) auxiliary power connectors



Is a Thunderbolt 3 cable included?

The Thunderbolt 3 cable is sold separately.

Do I need any special Firmware, Software, or Driver?

No firmware, software or driver is required from Magma, but you may need an updated driver for your PCIe card.

What types of PCIe cards can be used with the ExpressBox 3T-V3?

Check the Thunderbolt PCIe Card Compatibility for a list of cards that have Thunderbolt 3 Compatible drivers. If your PCIe card is not on this list, contact the card manufacturer to ask if they have a Thunderbolt 3 Compatible driver.

Is ExpressBox 3T-V3 compatible with Pro Tools?

Yes, ExpressBox 3T-V3 is officially supported by Avid for up to (3) Pro Tools|HDX cards.

Does a GPU or video card work with ExpressBox 3T-V3?

The GPU must be supported by the Operating System AND have a compatible Thunderbolt 3 Driver.

Can the Magma Thunderbolt 3 Interface add-in card be used in a Mac Tower?

No, it will not work as a add-in PCIe card in a Mac Tower.

Do older Thunderbolt devices on a Thunderbolt 3 daisy chain affect performance?

Yes. If you have a mix of generations on a Thunderbolt 3 daisy chain, make sure that the Thunderbolt devices sit after the Thunderbolt 3 devices on the chain. Anything placed after a first generation Thunderbolt device will operate at Thunderbolt speeds.

What controller cards are recommended for use when adding hard drives to the ExpressBox 3T-V3?

Magma recommends using either an ATTO ESAS H644 or an ATTO ESAS R644 HBA drive controller card with ExpressBox 3T-DB (Model EB3T-DB) . Please see our PCIe Card Compatibility Page for more Thunderbolt controller card options.

Support: or 877-438-2724


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