Thunderbolt 4 vs Thunderbolt 5: how big is the jump?

Double the bandwidth, plus a 120 Gbps burst mode for displays.

Thunderbolt 5 is the first true bandwidth leap since Thunderbolt 3. It doubles symmetric throughput from 40 Gbps to 80 Gbps, and adds a Bandwidth Boost mode that pushes up to 120 Gbps in one direction (with 40 Gbps back) specifically to drive high-refresh and multiple 4K/8K displays. PCIe tunneling jumps to 64 Gbps (PCIe 4.0-class), and guaranteed charging rises to 140W+.

See 1 TB over Thunderbolt 4

Baseline 40 Gbps copy time.

Estimate an 80 Gbps transfer

Enter 80 Gbps to see the Thunderbolt 5 case.

Compare drive bandwidth

Check whether your SSD can even saturate the link.

Time to move 1 TB

Backing up a 1 TB SSD at each interface's peak link rate. Thunderbolt 5's 80 Gbps halves the copy time of Thunderbolt 4 — but only if the drive at each end can actually sustain those speeds.

Thunderbolt 5 (80 Gbps) is 2.0× faster for this transfer.

Thunderbolt 4 (40 Gbps)3m 20s

40 Gbps sustained

Thunderbolt 5 (80 Gbps)1m 40s

80 Gbps sustained

Assumes the link is the bottleneck at the labeled speed. Real copies are also bounded by the slower drive at each end.

Try another file size? Open the Data Transfer Calculator

Option A

Thunderbolt 4

Wins 2 of 11 compared specs

Option B

Thunderbolt 5

Wins 6 of 11 compared specs

Side-by-side specs

Spec	Thunderbolt 4	Thunderbolt 5
Symmetric bandwidth	40 Gbps	80 Gbps (better on this spec)
Bandwidth Boost (1-way)	—	120 Gbps (better on this spec)
PCIe tunneling	32 Gbps	64 Gbps (better on this spec)
Min guaranteed charging	100W	140W (better on this spec)
Display support	2× 4K / 1× 8K	Multiple 4K/8K, high-refresh (better on this spec)
Connector	USB-C	USB-C
Backward compatible	USB4 / TB3	TB4 / USB4 / TB3
eGPU headroom	Limited	Much better (better on this spec)
Availability (2026)	Widespread (better on this spec)	Growing
Relative price	Lower (better on this spec)	Premium
Everyday dock/monitor	Plenty	Overkill

How they differ

For everyday use — a single 4K monitor, a dock, an external SSD — Thunderbolt 4 is already more than enough and Thunderbolt 5 won't feel different. The jump matters for specific high-end workloads: external SSDs that can exceed 40 Gbps, eGPUs (where 64 Gbps PCIe meaningfully reduces the bottleneck), and multi-monitor or high-refresh display setups that Bandwidth Boost is built for. Thunderbolt 5 is backward compatible with Thunderbolt 4, USB4, and Thunderbolt 3, so older gear keeps working at its own speed. In 2026 Thunderbolt 5 hosts and peripherals are still arriving and carry a price premium, so the value depends heavily on whether your workload can actually use 80–120 Gbps.

Verdict

Thunderbolt 5 is a genuine generational upgrade for creators, eGPU users, and anyone running high-refresh or multi-4K/8K displays. For typical laptop-and-dock use, Thunderbolt 4 remains plenty and the cheaper, more widely available choice. Buy Thunderbolt 5 for the workload, not the number.

See 1 TB over Thunderbolt 4

Which should you pick?

Choose Thunderbolt 4

Pick Thunderbolt 4 for mainstream docking, a single 4K display, and general external storage — it's mature, affordable, and indistinguishable from Thunderbolt 5 for these tasks.

See Thunderbolt 4 transfer times

Choose Thunderbolt 5

Pick Thunderbolt 5 for fast external SSDs beyond 40 Gbps, eGPUs that benefit from PCIe 4.0 tunneling, and high-refresh or multi-display setups where Bandwidth Boost's 120 Gbps is the point.

Estimate a Thunderbolt 5 transfer