Thunderbolt 5 raises the ceiling.
Its baseline bandwidth reaches 80Gbps, double Thunderbolt 4’s 40Gbps. That extra capacity targets demanding setups with high-resolution displays, high refresh rates, and fast external drives — not the average desk with one screen and a laptop.
The headline figure gets even bigger in the right conditions: Thunderbolt 5 can allocate 120Gbps in one direction and 40Gbps in the other. Thunderbolt 4 does not offer that bidirectional performance, giving Thunderbolt 5 more room for workloads that move large amounts of data while driving displays.
Bandwidth, displays, and power
Thunderbolt 4 can support one 8K display or two 4K displays at 60Hz. That remains enough for many mainstream workstations, especially when the setup does not need higher refresh rates or multiple high-resolution screens.
Thunderbolt 5 expands the display options. It can support multiple 4K displays at higher refresh rates or certain 8K configurations, making it better suited to demanding visual setups. The useful distinction is not simply that Thunderbolt 5 is faster; it can move more data while handling display requirements that push Thunderbolt 4 closer to its limits.
Power delivery also doubles as a selling point. Thunderbolt 5 brings 240 watts of power delivery, while Apple’s Thunderbolt 5 Pro cable supports up to 240W. Apple’s Thunderbolt 4 Pro cable maxes out at 100W — enough for many devices, but not a match for Thunderbolt 5’s upper limit.
That power increase matters most when one cable needs to handle demanding hardware and connected accessories. For buyers who only need ordinary charging and data transfer, 240 watts is impressive in the same way a second refrigerator is impressive in a studio apartment: useful in theory, unnecessary in practice.
Cable costs and compatibility
Thunderbolt 5 keeps compatibility broad. It works with Thunderbolt 4, Thunderbolt 3, and USB4 devices, so moving to a Thunderbolt 5 connection does not require abandoning every older device in the setup.
That compatibility does not turn older hardware into Thunderbolt 5 hardware. Devices and cables still operate according to the capabilities available to them, so a Thunderbolt 4 device will not gain an 80Gbps baseline bandwidth simply because it connects to Thunderbolt 5.
Apple’s cable options also show a practical trade-off. Apple’s Thunderbolt 4 Pro cables come in 1.8-meter and 3.0-meter lengths, priced at $129 and $159, respectively. The Thunderbolt 5 cable is only 1 meter and costs $69.
The shorter Thunderbolt 5 cable costs less than either listed Thunderbolt 4 Pro option, but length can matter more than a lower price when ports sit far from a display or external drive. A cheap cable that cannot reach the hardware is still a small piece of modern engineering theater.
Which version should you choose?
Most buyers should go with Thunderbolt 4 for mainstream use. Its 40Gbps bandwidth supports one 8K display or two 4K displays at 60Hz, which covers a broad range of everyday setups without paying for performance they will not use.
Thunderbolt 5 makes the stronger case for advanced users. It is more suitable for high-resolution, high-refresh-rate displays and fast external drives, especially when several demanding devices share one connection.
The choice is therefore less about replacing Thunderbolt 4 and more about matching the connection to the workload. Thunderbolt 5 delivers higher bandwidth, greater power delivery, and expanded display support; Thunderbolt 4 remains the sensible option when a setup does not need those upgrades.
