PCIe connectivity is not supported by USB 3 and is optional for USB4, whereas Thunderbolt™ 4 offers the most flexibility in which devices you can connect.
The high bandwidth of Thunderbolt™ 4 allows end users to connect their computers to external GPUs, storage drives, and PCIe enclosures. External Graphics, Storage, and PCIe Enclosures Also connect multiple devices into a Thunderbolt™ hub or dock that can be plugged into a Thunderbolt™ computer to consolidate all accessories into a single connection. Data, power, and video signals can flow from the computer and down the chain into five additional accessories. Daisy Chains, Hubs, and DocksĬonnect multiple Thunderbolt™ devices together in a daisy chain. Compared to the variable speeds of USB4, this requirement ensures that connections are always delivering peak file transfer speeds to support productivity, gaming, and content creation. The Thunderbolt™ 4 standard requires a total bandwidth of 40 Gbps, which it dynamically allocates between data and video for all devices on a single connection.
Thunderbolt™ 4 offers distinct advantages over USB-C with a more flexible and expansive set of capabilities.
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