ExpressBox 3T

ExpressBox 3T Thunderbolt

(3) Slot Thunderbolt 2 PCIe Expansion

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

Key Features

  • Cooling Hot-swappable Fan
  • Slots 3 PCIe Slots
  • Power 250 Watts
  • Speed 20 Gbps
  • Extras Additional fan

Connect (3) Full-length PCIe Cards using Thunderbolt

ExpressBox 3T

Part # eb3t

ExpressBox 3T provides an ‘outside-the-box’ solution for using PCIe cards with Thunderbolt 2-equipped computers. High-performance work flows are possible by connecting a Thunderbolt 2-equipped computer to a Thunderbolt 2 expansion chassis containing PCIe cards such as video capture, media transcoding, audio processing, and fast data storage. And because Thunderbolt 2 is also based on DisplayPort technology, you can daisy chain a high-resolution display with yournMagma ExpressBox 3T.


  • Supports (3) full-length PCI Express cards
  • Attach PCIe cards to Thunderbolt 2-enabled computer
  • Extension of PCI Express signals outside the computer
  • Daisy-chain or end-point device
  • Thunderbolt 2 features speeds up to 20Gbps


  • Easy Plug and Play installation
  • Use any combination of x1, x4, x8 and x16 PCIe cards
  • Hot-swappable cooling fan
  • Works with Mac OS X 10.6.8 or higher and Windows 7 and 8
  • Additional blower for extra hot cards
  • Optional built in drivebay for up to four (4) 2.5″ SSD or SAS/SATA drives
  • 250W power supply with (2) auxiliary power connectors

* Prices are in USD and do not include shipping or taxes.
** Customers outside US/Canada can order through a Worldwide Reseller.
  • We accept all major credit cards:
  • Credit Cards Accepted

ExpressBox 3T Specifications

EB3T Thunderbolt 2 to PCIe Expansion - 3 Slot
  • (3) Full-Length PCI Express Slots*
    • one x8 PCIe (slotted to accommodate x16 card)
    • one x8 PCIe
    • one x 4 PCIe
  • Compatible with ALL of card lengths: 1/2 length, 3/4 length and full length
Cable Required Thunderbolt (Sold Separately)
Interconnect Bandwidth 20 Gbps Bi-directional
Hard Drive Support Optional built in drivebay for up to four (4) 2.5" SSD or SAS/SATA drives
(when using the drivebay, maximum card length is limited to 8.5")
Material Aluminum Chassis
Dimensions 14.6” L x 4.3” W x 7.9” H (371mm x 110mm x 200mm)
Weight 6 lbs (2.72 kg)
System Cooling
  • (1) Hot Swappable Fan
  • (1) Removable Blower Fan
Power Supply
  • 250W, 100-240 VAC, 50-60HZ
  • Two 4-pin auxiliary power tabs
Ambient Temperature 0º to 50º C
Storage Temperature -20º to 60º C
Relative Humidity 5% to 85% non-condensing
Regulatory Compliance
FCC Class A Verified
RoHS Compliant
Supported Operating Systems
  • Windows 7, 8
  • Mac OS X Yosemite
30 day money back guarantee
1 year return to factory
Partner Approvals
Package Contents
  • Power Indicator
  • PCIe card slot openings
  • Thunderbolt 2 ports
  • Power cord socket
Hardware Included
  • Blower (if needed for cooling)
  • Carry Bag
  • U.S. Power Cord

ExpressBox 3T Frequently Asked Questions

Is a Thunderbolt cable included?

The Thunderbolt 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?

Check the Thunderbolt PCIe Card Compatibility for a list of cards that have Thunderbolt 2 Compatible drivers. If your PCIe card is not on this list, contact the card manufacturer to ask if they have a Thunderbolt 2 Compatible driver.

Is ExpressBox 3T compatible with Pro Tools?

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

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

The GPU must be supported by the Operating System AND have a compatible Thunderbolt 2 Driver.

Can the Magma Thunderbolt 2 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 2 daisy chain affect performance?

Yes. If you have a mix of generations on a Thunderbolt 2 daisy chain, make sure that the Thunderbolt devices sit after the Thunderbolt 2 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?

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.

ExpressBox 3T Docs and Drivers

Looking for more information to download or print? Product drivers? Below you will find everything from data sheets to warranties. If you still cannot find what you are looking for, please contact Magma directly and we will assist you.


Drivers and Utilities:

  • There are currently no drivers or utilities assigned to this product

If you are having trouble with your product installation please go to our drivers and utilities knowledge base.
If you still can't find what you are looking for, please contact us through our customer support hub.

Recommended Controller Cards:

Please see our Thunderbolt PCIe Card Compatibility list for controller card options.

Where to buy the ExpressBox 3T

Magma sells its products through a worldwide network of outstanding dealers and resellers. Purchase your Magma product today by finding the reseller closest to you and contacting them for pricing and availability. If you have product or sales questions about any Magma product, our resellers will be available to answer them.