Thunderbolt 3 is also the only specification (not Thunderbolt 4) that we’ve seen connecting to external GPUs, in case you’d like to try that approach. Thunderbolt 3 also supports a slower (16Gbps) PCIe connection for connecting to external storage.
Most manufacturers go beyond this, however, and our recommended docks support the full specification (and two 4K displays) unless noted. “Up to” is the key phrase: Thunderbolt 3 is only required to support a 10Gbps connection, allowing for a single external 4K display (a 16Gbps PCIe connection, paired with USB 3.2). Think of Thunderbolt 4 as the more restrictive version of Thunderbolt 3, with little room for any gotchas.Įssentially, Thunderbolt 3 and Thunderbolt 4 allow up to 40Gbps maximum bandwidth, enough for two 4K/60 displays. The longer answer, which we’ll describe below, is that there are differences, and parsing the nuances can be confusing. The short answer: Not that much, and we consider Thunderbolt 3 docks and Thunderbolt 4 docks to be functionally equivalent for most users.
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