The short answer: Not that much! Thunderbolt 3 and 4 are functionally equivalent, transferring data at 40Gbps.
Thunderbolt 5 is the 80Gbps version, but it will be backwards compatible with both Thunderbolt 3 and 4. You won’t see it until 2024, however. (If you own a laptop with a Thunderbolt 4 port, you’ll be able to use with a Thunderbolt 5 dock, Intel says. The only wrinkle is that a Thunderbolt 4 laptops will only pass data at its rated speed of 40Gbps.)
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For the sake of completeness, we’re going to detail some of the differences below. But if you’re new to this, let us reiterate: Thunderbolt 3 and 4 are basically the same, and Thunderbolt 5 won’t be an issue until 2024. Don’t sweat the details.
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Think of Thunderbolt 4 as the more restrictive version of Thunderbolt 3, with less room for any gotchas.
Essentially, Thunderbolt 3 and Thunderbolt 4 allow up to 40Gbps maximum bandwidth, enough for two 4K/60 displays. “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). Most manufacturers go beyond this, however, and our recommended docks support the full 40Gbps specification (and two 4K displays) unless noted. Thunderbolt 3 also supports a slower (16Gbps) PCIe connection for connecting to external storage.
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.
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Thunderbolt 4 doesn’t allow for any leeway—you’re getting a full-fledged 40Gbps connection (32Gbps PCIe + USB 3.2), no questions asked. For external storage, Thunderbolt 4 supports 32Gbps of data transfer—this really only matters for video, external GPU connections, or possibly games. Thunderbolt 4 supports “wake on sleep” from an external keyboard or mouse, which allows you to tap your external keyboard or wiggle your mouse to wake up your PC, which is handy. Thunderbolt 4 allows for longer cables and more Thunderbolt ports on laptops, too.
Device maker Anker has a nice summary of all of the technical features associated with Thunderbolt 3, Thunderbolt 4, and USB4, if you really want to get into the fine distinctions (below). What’s USB4? We address that in the next question.
Source: https://tholansonnha.com
Category: laptop
