Thunderbolt 5 doubles Thunderbolt 4's bandwidth on paper and adds a boost mode for displays. Whether that matters depends on what you connect: external SSDs, docks, high-resolution monitors and external GPUs benefit differently.
Thunderbolt 4 figures come from Intel's Thunderbolt 4 explainer and Thunderbolt 5 figures from Intel's September 12, 2023 announcement, both re-read on 2026-11-02.
Key differences at a glance
- Bandwidth: a constant 40 Gbps for Thunderbolt 4 against 80 Gbps in each direction for Thunderbolt 5, with Bandwidth Boost up to 120 Gbps for display-heavy use.
- PCIe: Intel says Thunderbolt 5 doubles Thunderbolt 4's PCIe data rate.
- Foundations: Thunderbolt 4 is compatible with USB4; Thunderbolt 5 builds on USB4 Version 2, DisplayPort 2.1 and PCIe Gen 4.
- Cables: Thunderbolt 4 cables up to 2 m; Thunderbolt 5 passive cables up to 1 m, using PAM-3 signalling.
- Compatibility: Intel states Thunderbolt 5 is fully compatible with previous Thunderbolt and USB versions.
Specification comparison
| Feature | Thunderbolt 4 | Thunderbolt 5 |
|---|---|---|
| Bandwidth | Constant 40 Gbps required | 80 Gbps bidirectional; Bandwidth Boost up to 120 Gbps |
| Displays | Up to two 4K 60 Hz or one 8K 60 Hz | Not stated (DisplayPort 2.1 base standard) |
| PC charging | Up to 100W | Not stated |
| PCIe | Not stated | Doubled PCIe throughput vs Thunderbolt 4; PCIe Gen 4 |
| Foundation | Compatible with USB4 | USB4 V2, DisplayPort 2.1, PCIe Gen 4 |
| Cable length | Up to two meters | Passive cables up to 1 m (PAM-3) |
| Compatibility | Daisy chain up to five additional devices | Compatible with previous Thunderbolt and USB versions |
Shaded cells mean the cited sources did not state the value. We do not fill gaps from memory.
Bandwidth and what uses it
Thunderbolt 4 guarantees 40 Gbps shared between data and video. Thunderbolt 5 raises that to 80 Gbps in each direction, and Bandwidth Boost reallocates lanes to deliver up to 120 Gbps toward displays. External NVMe enclosures, high-refresh 4K or 6K displays and external GPU enclosures are the devices most likely to use the extra headroom; keyboards, audio interfaces and most hubs are not.
Displays and charging
Intel's Thunderbolt 4 page lists support for two 4K 60 Hz displays or one 8K 60 Hz display, up to 100W PC charging and 15W for accessories. Intel's Thunderbolt 5 announcement targets higher-resolution, lower-latency displays but gives no specific resolution or charging figures, so we do not state them.
Cables and compatibility
Thunderbolt 5 passive cables are limited to 1 m, half Thunderbolt 4's 2 m, because faster signalling (PAM-3) is harder to carry over distance. Both are backward compatible: a Thunderbolt 4 device works on a Thunderbolt 5 port and vice versa, at the lower standard's capabilities.
Should you wait for Thunderbolt 5?
Only if both your computer and your devices support it and you have a bandwidth-heavy use. Intel's announcement expected products starting in 2024; check your computer's specifications, because the USB-C connector looks the same on every generation.
Strengths and limitations
Thunderbolt 4
Strengths
- Constant 40 Gbps, up to 100W laptop charging and cables up to 2 m are stated.
Limitations
- 40 Gbps ceiling.
Thunderbolt 5
Strengths
- Double the bandwidth and PCIe throughput; boost for displays.
Limitations
- Passive cable limit 1m; charging power not stated on the page.
Pricing not verified
Prices change and vary by region and retailer, so none is shown. Check the manufacturer or a current retailer.
Which should you choose?
- Common docks, SSDs, displays: Thunderbolt 4 — widely supported baseline
- Maximum bandwidth for fast external SSDs or high-end displays: Thunderbolt 5 — 80/120 Gbps
Our verdict
Thunderbolt 5 matters when both the host and your device support it. The cited Intel pages do not state real-world speeds.
Frequently asked questions
Is Thunderbolt 5 twice as fast as Thunderbolt 4?
Intel lists 80 Gbps in each direction against Thunderbolt 4's 40 Gbps, and up to 120 Gbps with Bandwidth Boost for displays. Real device speeds depend on the drive or display.
Can I use Thunderbolt 4 cables with Thunderbolt 5?
Intel states Thunderbolt 5 is compatible with previous versions, but you only get Thunderbolt 5 speeds with a Thunderbolt 5 cable and devices at both ends.
How long can a Thunderbolt 5 cable be?
Intel's announcement lists passive cables up to 1 m.
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How this was checked
Specifications compiled on 2026-11-02 from the sources below. The cited sources were re-opened and the key table values re-checked on 2026-11-02.
Both Intel pages re-read on 2026-11-02; listed values matched.
Disclosure: AYORAHUB did not hands-on test these products or services. Nothing on this page is a lab measurement, benchmark or review score; analysis explains what the cited specifications mean in practice.
- Intel's TB5 article is dated Sep 2023; later product details may differ.
- Items marked not stated were absent from the cited page.
Sources
- What Is Thunderbolt 4 and How Is It Different from USB-C? — Intel (manufacturer/official)
- Intel Introduces Thunderbolt 5 Connectivity Standard — Intel Newsroom (manufacturer/official, 2023-09-12)