This article covers StarTech PCIe外付けケース Thunderbolt 3 PCI Express 3.0 x16 4K.

Overview

The StarTech TB31PCIEX16 is an external Thunderbolt 3 PCIe expansion chassis that adds a single PCI Express slot to laptops or desktops via a Thunderbolt 3 connection. With up to 40Gbps bandwidth, it lets you connect video capture cards, high-speed network adapters, NVMe SSD adapters, and other low-power PCIe cards. The tool-less aluminum case includes a 120mm fan for active cooling, and a built-in DisplayPort output supports 4K/5K displays at 60Hz.

Connectivity & Compatibility

Connectivity is via Thunderbolt 3 (USB-C) port, backwards compatible with Thunderbolt 4. A second Thunderbolt 3 port supports daisy chaining up to six devices. The PCIe slot is physically x16 but is not intended for graphics cards – only single-width, low-power cards up to 203mm in length are supported. The bundled 65W power adapter supplies up to 25W through the PCIe slot and an additional 30W via an internal LP4 connector. DisplayPort output allows direct video from the chassis without needing a separate adapter.

Product Info

Model TB31PCIEX16 from StarTech.com is positioned as a mid-range Thunderbolt 3 PCIe expansion solution. It has been on the market since around 2017 but remains available through . The unit comes with a 2-year warranty, free lifetime technical support, a 50cm Thunderbolt 3 cable, and a 65W universal power adapter (interchangeable plugs). Pricing typically falls around ¥50,000–60,000 in Japan. The chassis is built from extruded aluminum with a sleek black finish.

Best Use Cases

Content creators and streamers: Ideal for adding a capture card to a slim laptop without internal slots. The 40Gbps bandwidth ensures low-latency video capture. Not suitable for GPU eGPU setups. Business professionals needing legacy connectivity: Connect a FireWire card, 10GbE NIC, or NVMe adapter to a modern laptop lacking those ports. Works best when only one expansion card is needed. Network/storage expanders: Add a high-speed storage adapter or network card to a Thunderbolt-equipped system. Be mindful of power limits – only cards drawing under 25W from the slot will work reliably.

Product Disclosure (Amazon)

  • Manufacturer: StarTech.com(スターテック)
  • Seller: Startech Japan KK
  • Fulfilled by: Amazon
  • ASIN: B075RJHLB4
  • Note: This article covers a manufacturer-made product based on Amazon listing details.