In the real world, things are slightly more complicated. (A Dell support page, for example, details its four-lane and two-lane laptops.) Essentially, a 20Gbps connection should be enough for a single 4K monitor running at 60Hz, with a bit of extra bandwidth for other data transfers among connected peripherals.) And while the vast majority of Thunderbolt 3-equipped laptops are designed with four PCIe lanes for a total of 40Gbps, some laptops only ship with two PCIe lanes for a total of 20Gbps. (There are very rare exceptions: A new USB 3.2 Gen 2×2 spec can pair two 10Gbps channels together, creating an aggregate 20Gbps hub. Intel is expected to unveil an 80Gbps version of Thunderbolt this year, meaning that you’ll likely see 80Gbps-capable Thunderbolt docks in 2024. Thunderbolt 4 differs very slightly in that it supports a theoretical maximum of 32Gbps for external storage devices, but you probably won’t notice the difference. Thunderbolt 3 and 4 ports, the most common standard, transfer data at up to 40Gbps. Most USB-C ports are built on the second-generation USB 3.1 data-transfer standard, which transfers data at 10Gbps. Kensington Thunderbolt 4 Dual 4K Dock (SD5780T) review However, this dock didn’t present any performance or thermal issues, and if you understand that one of the Thunderbolt ports can be used for charging your smartphone, you’ll find this dock delivers virtually everything you’ll need. Kensington’s dock was also worryingly expensive when we first reviewed it, but price cuts have brought the price way down from $399 to about $260 or so. If flexibility is what you want, we’d recommend our runner-up pick, the Plugable TBT3-UDZ, instead. It’s not perfect this dock only includes support for one display port, requiring you to buy a converter cable or dongle. Kensington Thunderbolt 4 Dual 4K Dock (SD5780T) is the winner. We then thought that the Plugable UD-4VPD would fit the bill, but an intensive gaming session caused the dock to overheat and shut down. ![]() We originally thought our best pick would be the Kensington SD5760T, a dock that featured an ideal mix of ports on paper but also some performance issues.
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