Caldigit dual hdmi5/21/2023 ![]() Power output: Thunderbolt docks can charge your computer, too, so you don’t have to worry about plugging in a second cable.(Apple’s late-2020, M1-based MacBooks support only one external display, even if you’re using a dock.) We set each monitor to its maximum resolution and verified that both were performing at the proper refresh rate. Using an array of DisplayPort cables, HDMI cables, and USB-C adapters, depending on each dock’s port selection, we connected our 16-inch MacBook Pro and a pair of 4K monitors to each dock. Video: Almost all Thunderbolt docks promise dual 4K monitor support at a full 60 Hz, assuming your computer and monitors support it we ruled out any that couldn’t handle two monitors at once.The docks we tested offered a range of port speeds, from USB 2.0 at 480 Mbps to USB. ![]() To measure the read and write speeds of each, we ran AJA System Test speed tests using Samsung’s Portable SSD T5 for the USB ports and the now-discontinued LaCie Bolt 3 for the Thunderbolt ports. USB-C ports are less common, as are extra Thunderbolt ports. USB-A, USB-C, Thunderbolt 3 or 4: The “standard” USB-A port is still the most common input for peripherals-including external drives, wired keyboards, and more-and most Thunderbolt docks have several of them.
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