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ExpressBox 3T

ExpressBox 3T Thunderbolt™ 2 Expansion Chassis
ExpressBox 3T
ExpressBox 3T with Avid Logo
ExpressBox 3T - Front and Rear Views
ExpressBox 3T - Cover Removal
ExpressBox 3T - Cover
ExpressBox 3T - Top View
ExpressBox 3T - Auxiliary Power Cables
ExpressBox 3T - Fan Removal
ExpressBox 3T - Carrying Bag
ExpressBox 3T with MacBook Pro
ExpressBox 3T
ExpressBox 3T with Avid Logo
ExpressBox 3T - Front and Rear Views
ExpressBox 3T - Cover Removal
ExpressBox 3T - Cover
ExpressBox 3T - Top View
ExpressBox 3T - Auxiliary Power Cables
ExpressBox 3T - Fan Removal
ExpressBox 3T - Carrying Bag
ExpressBox 3T with MacBook Pro
Availability: In Stock
Model: EB3T
Starting at: $999

Select Your Options

Prices are in USD and do not include shipping, taxes or duties

Attach (3) full-length PCIe cards to your Thunderbolt equipped computer.

ExpressBox 3T

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 your Magma ExpressBox 3T.

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

Expand your Mac Pro capabilities


- Add a sidekick to your superhero

- Easily connect extra PCIe slots to your Mac Pro


- Quickly access your Mac Pro ports

- Features slide out tray and secure bracket


The perfect chassis for RED users

The KIT-RED gives the user the option to utilize their RED ROCKET card without the need for the BNC connector bracket that would normally occupy a valuable PCIe slot. Instead, Magma's RED ROCKET Kit provides a two-in-one solution by adding special mounting holes for BNC connectors directly above the Host card on the same bracket.The kit also provides the necessary auxiliary power adapter that is required for the RED ROCKET granting users full functionality of their cards.

Attach (3) full-length PCIe cards to your Thunderbolt 2-equipped computer.

EB3T Thunderbolt 2 to PCIe Expansion - 3 Slot

(3) Full-Length PCI Express Slots*

  • one x8 PCIe (slotted to accomodate x16 card)
  • one x8 PCIe
  • one x 4 PCIe

*Maximum card length is limited to 8.5"

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*
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  
Mac Compatibility Mac OS X Yosemite
PC Compatibility Windows 7, 8
30 day money back guarantee 1 year return to factory
Partner Approvals  
Avid Universal Audio
Lynx Studio Apogee
See PCIe Card Compatibility Page for more  
Package Contents  
ExpressBox 3T – Front and Rear View

1. Power Indicator
2. PCIe card slot openings
3. Thunderbolt 2 ports
4. Power cord socket




Hardware Included

5. Blower (if needed for cooling)
6. Carry Bag
7. U.S. Power Cord

ExpressBox 3T - Front and Rear Views

*When using the drivebay, maximum card length is limited to 8.5"


Attach (3) full-length PCIe cards to your Thunderbolt 2-equipped computer.

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 ExpressBox 3T?

Check the PCIe Card Compatibility Page 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 the only Thunderbolt 2 PCIe Expansion Chassis officially supported by Avid for Pro Tools|HDX. Read the details on the Avid website.

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?



Attach (3) full-length PCIe cards to your Thunderbolt 2-equipped computer.

PCIe Card Compatibility List




Quick Start Guide


Thunderbolt™ 2 Upgrade QSGThunderbolt™ 2 Upgrade QSG


User Manual


Expansion I/O Whitepaper




Terms and Conditions

Attach (3) full-length PCIe cards to your Thunderbolt 2-equipped computer.

Attach (3) full-length PCIe cards to your Thunderbolt 2-equipped computer.

“I've been using a pre-production unit since mid-May, and it's fantastic. I've got HD Native running with an early 2011 17" Macbook Pro, and so far this setup handles anything my old HD2 1/2 would do. I say 2 1/2 because I had an HD2 Accel plus an additional HD process card (not Accel). I'm still using my 2 192 I/O's with additional cards for 24 analog I/O and it's been great. I primarily do work that doesn't utilize lots of virtual instruments, but nevertheless this system has been super solid.


I'm currently using a 27" Apple LED Cinema Display daisy-chained off of the ExpressBox 3T, and external FW drive attached to my MacBook Pro for audio. Great system, so far very pleased!”


- Tommy Dwyer, Audio & Music Production



"The strength of the Magma ExpressBox 3T is its ability to make your PCIe adapters function with any Mac with a Thunderbolt port. Some professionals need to work in remote locations. Rather than schlep their Mac Pro to that location, they can pull the storage adapters or video/audio adapters out of their Mac Pro, install them in the ExpressBox 3T, and connect it to a MacBook Pro. During our comparative testing, we moved the ATTO ExpressSAS R644 RAID adapter back and forth between the Mac Pro and a 2012 iMac connected to the ExpressBox 3T. When the ExpressBox 3T and drive enclosure were powered up, the four SSD RAID 0 set mounted instantly and was ready to go. And though we demonstrated the limits of the transfer speeds over Thunderbolt, those speeds are fully adequate for many video and audio applications. Magma states that there is sufficient bandwidth for audio DSP with Pro Tools. Also Red uses ExpressBox 3T to run Red Rocket cards on their Thunderbolt Macs for all of their 'Reducation' tours."
(Read the full review here)


- Rob Art Morgan, Mac Performance Consultant, Bare Feats



"Just wanted to say thanks for getting us our Thunderbolt enclosure so quickly. We have the Red Rocket in it and our Red Epic workflow is greatly improved, saving us both time and money on this job. We definitely recommend your company!"


- Amon Baker, Après Visuals, Video & Film Production



"Qualifying our UAD-2 PCIe DSP Accelerator cards for peripherals like the Magma ExpressBox 3T is another important step in bringing our customers next-generation connectivity to their audio production workflow. Now our customers have the flexibility to use their PCIe cards with a whole slew of new Apple products besides the Mac Pro tower — including MacBook Pros."


- Lev Perrey, Director of Product Management, Universal Audio



"Thunderbolt technology combines high-speed data and display transfers, delivering great responsiveness with absolute ease of use. Magma’s upcoming products will use Thunderbolt technology to extend system capabilities even further."


- Jason Ziller, Director of Thunderbolt Marketing, Intel



Apple Avid Red ATTO Technology, Inc. Universal Audio AJA Video Systems Small Tree
Solid State Logic Blackmagic Design Promise Technology, Inc. Focusrite Apogee Caldigit OCZ Technology
Fusion-io RME Lynx Studio Technology RunCore Storage DNA LSI ExaSAN
SNS FirmTek Matrox Tools on Air Solarflare Maxx Digital HighPoint Technologies, Inc.
Corning Cable Systems DeltaCast G-Technology Bluefish444      

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