Thunderbolt
A high-speed I/O standard (Thunderbolt 4: 40 Gbps; Thunderbolt 5: 80–120 Gbps) carried over USB-C connectors. Supports DisplayPort, PCIe, USB, and power delivery on a single cable.
Thunderbolt 4 and Thunderbolt 5 use the USB-C connector but add PCIe tunneling, dual-DisplayPort, and 100W+ power delivery in a single cable.
TB4 vs TB5 vs USB4
- TB4 — 40 Gbps, dual 4K or single 8K display, PCIe 32 Gbps.
- TB5 — 80 Gbps base / 120 Gbps boost, triple 4K or single 8K+, PCIe 64 Gbps.
- USB4 — same connector, similar bandwidth, but TB certification adds guarantees TB-specific features work.
Why it matters for laptops
A single TB cable can carry video to two external monitors + USB peripherals + 100W charging — the foundation of one-cable docking. For creators, TB-attached external SSDs hit native NVMe speeds.
Look for TB4 on both sides of premium laptops; some only put TB on one side, which limits dock placement.
How to use Thunderbolt in a real comparison
A high-speed I/O standard (Thunderbolt 4: 40 Gbps; Thunderbolt 5: 80–120 Gbps) carried over USB-C connectors. Supports DisplayPort, PCIe, USB, and power delivery on a single cable. In practice, this is most useful as one part of a decision rather than a standalone quality badge. Compare it alongside the workload, room, ecosystem, budget, and ownership constraints that apply to you; the strongest published figure is not automatically the best outcome for every buyer.
What to check next
On vsMars, read together so the value has product-specific context. It is especially relevant in .
Avoid the one-number trap
Manufacturers can describe the same capability under different conditions. Compare like-for-like variants, check the unit and test condition where available, and use a head-to-head page to see whether a measurable difference is material for your own use.
vsMars presents structured catalog values to make trade-offs legible. The linked product and spec pages are the right place to inspect the underlying values before buying.