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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Thunderbolt 5 raises the link bandwidth and PC PCIe data requirement compared with Thunderbolt 4, making it a more capable connection on paper for external GPUs and PCIe expansion enclosures. Intel lists 80 Gbps bidirectional bandwidth and a 64 Gbps PC PCIe data requirement for Thunderbolt 5, versus 40 Gbps and 32 Gbps for Thunderbolt 4. Those specification changes do not guarantee a particular eGPU speed increase: the computer, controller, enclosure, graphics card, workload, and display setup all affect the result.
What changes from Thunderbolt 4 to Thunderbolt 5?
Thunderbolt 5 increases the headline link bandwidth and doubles Intel’s stated PC PCIe data requirement in its comparison with Thunderbolt 4. It also raises the listed display and available charging capabilities. The figures describe platform requirements and capabilities, not a benchmark for every enclosure or computer.
| Specification in Intel’s comparison | Thunderbolt 4 | Thunderbolt 5 |
|---|---|---|
| PC link speed | 40 Gbps | 80 Gbps bidirectional |
| PC PCIe data requirement | 32 Gbps | 64 Gbps |
| PC video requirement | Dual 4K | Dual 6K |
| Available charging capability | Up to 140 W | Up to 240 W |
These are the comparison figures in Intel’s 2023 Thunderbolt 5 technology brief. Charging maxima are available capabilities, not a promise that every computer supplies or accepts the maximum; device support varies. Intel’s Thunderbolt overview also describes Thunderbolt 5 bandwidth and PCIe Gen 4 support.
What 120 Gbps means
Thunderbolt 5’s 120 Gbps figure is not its ordinary bidirectional bandwidth. Intel describes Bandwidth Boost as a display-heavy mode that can allocate up to 120 Gbps for transmission and 40 Gbps for reception when high display bandwidth is needed. It is an asymmetric allocation, not 120 Gbps in both directions, and it should not be treated as a general-purpose eGPU or compute speed.
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- Add Connectivity & Unlock Performance: Expand your computer with a high-performance PCIe card over Thunderbolt 5. Ideal external PCIe expansion for Mac, Windows, and Linux systems.
- Thunderbolt 5 to PCIe Expansion: Delivers up to 6000 MB/s bi-directional PCIe bandwidth for pro audio, video, storage, and networking cards.
- Wide PCIe 4.0 Card Compatibility: Supports half-length+ (7.75"), full-height, single-width PCIe 4.0 x8 cards—plus most cards that require a daughter card.
- Pro-Level Power & Connectivity: Includes auxiliary PCIe power for power-hungry cards. Second Thunderbolt port enables daisy-chaining and provides 15W to connected peripherals.
- Compact, Quiet & Rugged Build: Lightweight aluminum enclosure with temperature-controlled, variable-speed fan for extremely quiet cooling; perfect for desktops, studios, and on-set workflows.
What does the PCIe change mean for an eGPU?
An external GPU uses the connection between the computer and enclosure to move data to and from the graphics card. A higher PCIe data requirement gives Thunderbolt 5 more headroom at the platform level than Thunderbolt 4. That makes it more promising for PCIe expansion and external graphics, but it does not establish a fixed frame-rate gain or mean every eGPU will run twice as fast.
The realized result depends on the complete system: the host’s Thunderbolt implementation and PCIe support, the enclosure controller and its design, the GPU, the application or game, and how displays are connected. Display-oriented Bandwidth Boost is not evidence of a corresponding uplift in gaming or GPU-compute workloads. The Intel brief specifies requirements; it is not a controlled, matched Thunderbolt 4-versus-5 benchmark for every enclosure.
Rank #2
- Dual-Slot Thunderbolt 5 PCIe Expansion System: Connect two high-performance, non-GPU PCIe cards to your computer using Thunderbolt cables. Supports all Thunderbolt-compatible, single-width PCIe cards, regardless of card length or height—ideal for professional expansion workflows.
- Dual Thunderbolt 5 Interfaces with Full Bandwidth Per Slot: Features two Thunderbolt 5 connections and two PCIe 4.0 slots, delivering up to 6000 MB/s of PCIe bandwidth to each card simultaneously—no shared bandwidth, no performance compromise.
- Built for Bandwidth-Hungry Workflows: Run DV I/O cards, ultra-fast NVMe SSD adapters, and multi-port 10GbE or 25GbE network cards at full performance at the same time—perfect for video production, post-production, audio, and data-intensive environments.
- Integrated 400W Universal Power Supply: Includes dual 75W auxiliary PCIe power connectors for power-hungry cards, plus 15W of power from secondary Thunderbolt ports for connected peripherals and Thunderbolt daisy-chaining.
- Rugged, Quiet, and Broadly Compatible: Housed in durable aluminum and designed for quiet operation. Compatible with macOS (Apple silicon and Intel Macs), Windows PCs with Thunderbolt 5, Thunderbolt 4, or USB4, and Linux systems.
Can a Thunderbolt 4 enclosure work with a Thunderbolt 5 computer?
Intel says Thunderbolt 5-based PCs are backward-compatible with Thunderbolt 4 and Thunderbolt 3 accessories in its Thunderbolt 5 gaming compatibility guidance. This is a useful starting point, not a substitute for checking the exact computer, enclosure, operating system, cable, card, and manufacturer support information. Backward compatibility also does not turn a Thunderbolt 4 enclosure into a Thunderbolt 5 one; its capabilities remain those of its own design.
A USB-C connector by itself does not establish Thunderbolt support or the PCIe tunneling needed by an eGPU. Confirm the computer’s port specification and the enclosure’s host requirements. Intel’s Thunderbolt 4 enclosure guidance likewise emphasizes checking device compatibility.
Rank #3
- Expands Small Machines: Use video capture, high-speed fiber/Ethernet, NVMe RAID, audio I/O, and other cards to unlock the potential of MacBooks, Mac Studio, Mac mini, and other space-constrained computers lacking a PCIe slot
- Internal Class Speed: Over 6000MB/s bandwidth available for simultaneous read/write
- Pro Level Card Ready: (1) PCIe 4.0 x4 (x16 mechanical slot) for half-length, full-height, single or double-width cards
- Expanded Connectivity: Three Thunderbolt 5 (USB-C) 80Gb/s ports each with 15W power delivery for more device, display, and drive possibilities
- 3 Year OWC Limited Warranty
What to check before choosing an enclosure
Compare the specific host and enclosure rather than choosing by the Thunderbolt version alone. Verify these points in the manufacturers’ documentation:
- Host port and PCIe support: Confirm the computer has the required Thunderbolt connection and supports the enclosure’s PCIe use. USB-C shape alone is not enough.
- Controller and advertised capability: Check the enclosure’s controller and PCIe specifications. Intel’s PC PCIe requirements do not state the bandwidth every enclosure will deliver in practice.
- Card fit: Match the graphics card’s length, width, and slot thickness to the enclosure’s clearance.
- Power and cooling: Check whether a power supply is included, its rating and required cables, and the enclosure’s cooling arrangement.
- Ports and docking needs: If you need USB, Ethernet, or other dock functions, confirm they are built in or plan for a separate dock.
- Software support: Verify the host operating system, firmware, and driver guidance for both the computer and enclosure. Intel directs users to device manufacturers for device-specific drivers and firmware.
A Thunderbolt 5 enclosure example
Tom’s Hardware reported on July 16, 2025, that the Razer Core X V2 is a Thunderbolt 5 eGPU enclosure supporting full-size PCIe Gen 4 graphics cards. The report says it has no included power supply, USB ports, or Ethernet, so a buyer would need to account for power and any separate connectivity needs. These are details of that reported model, not features shared by all Thunderbolt 5 enclosures. See the Tom’s Hardware report, and verify current specifications with the manufacturer before purchase.
Rank #4
- ENHANCED COMPATIBILITY - Seamlessly integrates with macOS 14+, Windows 11, and Linux 6.1+ systems, supporting Thunderbolt 5, 4, and USB4 ports for broad device connectivity.
- ROBUST EXPANSION - Features two x16 mechanical (x4 electrical) PCIe 4.0 expansion slots, accommodating two full-length, full-height, single-width PCIe cards.
- OPTIMAL POWER DELIVERY - Provides two 6-pin auxiliary power connectors, each supplying up to 75W for PCIe cards requiring supplemental power.
- VERSATILE CONNECTIVITY - Equipped with four Thunderbolt ports and a C14-type power input, ensuring comprehensive peripheral and power management.
- RACKMOUNT INTEGRATION - Designed as a 2U Thunderbolt rackmount enclosure, offering a professional and space-efficient solution for your setup.
How to decide between Thunderbolt 4 and Thunderbolt 5
If you already own a Thunderbolt 4 enclosure that is explicitly supported by your computer and operating system, its compatibility matters more than upgrading based on bandwidth figures alone. If you are selecting a new setup, Thunderbolt 5 offers higher stated link and PC PCIe requirements, but weigh those against the exact host, enclosure design, card fit, power supply, ports, and software support. The available specifications do not identify a universal best enclosure or establish a standard real-world performance uplift.
Quick Recap
Best Value
- THUNDERBOLT 3 PCIE EXPANSION CHASSIS: Add PCI Express support to a Thunderbolt 3/4 capable laptop / desktop computer; Increased productivity with Thunderbolt 3 and up to 40Gbps bandwidth; One external PCIe 3.0 x16 slot; Thunderbolt cable included
- EXPANDABILITY FOR LAPTOPS: Integrate video capture cards, high-speed fiber / ethernet connectivity, NVMe drives, FireWire cards, and more to unlock the potential of a notebook using this Thunderbolt 3 to PCIe chassis; Toolless design; Aluminum build
- 5K & 4K DISPLAY SUPPORT: Connect a display through the external PCIe enclosure; The DisplayPort and TB3 ports support various video outputs up to 4K/5K 60Hz (other video resolutions are also supported); PCIe Box does not support GPU graphic cards
- ROBUST POWER: The chassis delivers 25W via the PCIe slot and the LP4 port on the other side of the unit supports up to 30W between the 12V and 5V rails.; 12V 5A (65W) universal power adapter is included and is compatible w/ NA/JP, UK, EU, and ANZ regions
- COMPATIBILITY: Use single-width cards up to 8in (20.3cm) long; Built-in fan for active cooling; Daisy chain compatible with multiple TB3/4 devices; The chassis is driverless and is compatible with macOS, Windows; TAA-compliant
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
