Can you use it for desktop computers?

As long as the desktop has a Thunderbolt 3 port (NOT a USB-C, it ust be Thunderbolt 3) then yes, it can be used with a desktop.

What types of PCIe cards can I add using this expansion chassis?

You can add PCIe cards such as SSD, Ethernet or Fiber, Video Capture, USB, FireWire, or eSATA cards to this Thunderbolt 3 expansion chassis.

What is the data transfer rate for this expansion chassis?

The data transfer rate for this expansion chassis is up to 40 Gbps.

Is this device compatible with my Windows 7 system?

Yes, this device is compatible with Windows 7 (32-bit or 64-bit).

Can this expansion chassis support a 5K monitor?

Yes, this expansion chassis supports 5K Thunderbolt displays.

Can I use one of these PCI-express1394b3lp cards with this chasis? I want to use an old audio interface that only works with firewire connection. I want to connect this chasis to a thunderbolt 3 port.

Yes, you can use PCIe cards such as an SSD / Ethernet or Fiber / Video Capture / USB / FireWire or eSata cards with this chassis.

Can you verify that it sustains a 40Gbps read/write speed?

Yes, the product supports up to 40Gbps bandwidth with Thunderbolt 3.

Will this work with an Intel coprocessor card?

It will work with any PCIe x16 card that *doesn't* require external power connections. Any cards that require a 6 pin or 8 pin auxillary power input will *not* work with this chassis. An Intel Xeon Phi card requires PCIe auxillary power, so it wouldn't work in this chassis.

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StarTech.com TB31PCIEX16 Thunderbolt 3 PCIe Expansion Chassis - Thunderbolt 3 to 16 x PCIe - Aluminum - PCIe SSD - External PCIe Enclosure - PCIe Slot

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Add an external PCI Express 3.0 x16 slot and a 4K DisplayPort connection to your Thunderbolt 3 MacBook or laptop
Add PCIe cards such as an SSD / Ethernet or Fiber / Video Capture / USB / FireWire or eSata cards to your Thunderbolt 3 laptop
Add an additional PCIe card to a Thunderbolt 3 computer
Increased productivity with Thunderbolt 3 and up to 40Gbps bandwidth
Thunderbolt 3 to PCIe / Thunderbolt 3 PCIe Enclosure / Thunderbolt 3 Expansion Chassis / Thunderbolt 3 PCIe Box

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Add an external PCI Express 3.0 x16 slot and a DP connection to a Thunderbolt 3

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Model
Brand	StarTech.com
Model	TB31PCIEX16

Details
Type	Thunderbolt 3 to PCIe x16 and DisplayPort
Thunderbolt	Yes
External Ports	2 x Thunderbolt 3 USB-C (24-pin) Female 1 x DisplayPort (20 pin) Female
Internal Ports	1 x PCI Express x16 Female
Data Transfer Rate	Up to 40 Gbps (Thunderbolt 3)
Operating Systems Supported	Windows 10 (32-bit or 64-bit), 8 / 8.1 (32-bit or 64-bit), 7 (32-bit or 64-bit) macOS 10.12 (Sierra)
Specifications	Fan(s): 1 x 92 mm fan Air Flow Rate : 14.06 CFM Noise Level: 24.55 dB Fan Bearing Type: Sleeve Bearing Chipset ID: Intel - Alpine Ridge DSL6540 LED Indicators: 1 x Power(Blue) Center Tip Polarity: Positive Input Current : 2A Input Voltage : 100 ~ 240 AC Output Current: 5.417A Output Voltage: 12 DC Power Consumption (In Watts): 65W Power Source: AC Adapter Included Note: This expansion chassis does not provide full power delivery but will provide 15W of power, resulting in a slow charge to some laptops, such as MacBook Pro. When the dock is connected to your host laptop, a charging icon may appear on your laptop's screen. This is only sufficient enough to charge your laptop in sleep state, and charging will require an extended time period. 5K support can only be achieved using a Thunderbolt 3 5K monitor. DisplayPort 5K monitors will not work with this expansion chassis. A 4K-capable display is required to achieve 4K x 2K resolution (4K is also known as 4K x 2K). Certain monitors may be limited to 4K at 30Hz when connecting through DisplayPort. These monitors include the following models: Dell P2715Q, Viewsonic VX2475Smhl-4K, Philips 288P6LJEB, LG 31MU97C-B, Asus PB287Q (these models will need to be set to 4K at 30Hz). When connecting a display to one of the Thunderbolt 3 USB-C ports, a USB-C video adapter might be required depending on the input of your display. The expansion chassis does not support video cards. Secondary Thunderbolt 3 port can also be used to connect USB 3.1 (10Gbps) USB-Type C devices, such as USB 3.1 Hubs. Backwards compatible with USB 3.0 (USB 3.1 Gen 1), and USB 2.0.

Features
Features	Increased productivity with Thunderbolt 3 and up to 40Gbps bandwidth — twice the speed of Thunderbolt 2 (20Gbps) and eight times faster than USB 3.0 (5Gbps) Supports one 4K DisplayPort monitor, and a second extended monitor display through the Thunderbolt 3 (USB-C) port Daisy chain up to six Thunderbolt 3 devices Supports 5K Thunderbolt displays Supports half-length and dual-slot PCIe card standards at all heights, with standard profile slot brackets Provides a x16 4 lane PCIe 3.0 slot or interface Durable aluminum construction Works on Mac and Windows computers Internal 60 cm cooling fan

Dimensions & Weight
Dimensions	3.20" x 2.20" x 10.70" (L x W x H)
Weight	3.30 lbs.

Packaging
Package Contents	1 x Thunderbolt 3 PCIe expansion box 1 x Thunderbolt 3 cable 4 x rubber feet 1 x universal power adapter (NA/JP, UK, EU, ANZ) 1 x quick-start guide

Additional Information
First Listed on Newegg	September 15, 2025

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StarTech.com TB31PCIEX16 Thunderbolt 3 PCIe Expansion Chassis - Thunderbolt 3 to 16 x PCIe - Aluminum - PCIe SSD - External PCIe Enclosure - PCIe Slot

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