Kensington SD5780T: Can Both Monitors Use the Connections on Your Desk?

Two HDMI cables hang over the back of the desk. Each fits a monitor, but only one plugs directly into the Kensington SD5780T. This is an easy detail to miss when the shopping list says “dual monitors” and the box says “dual 4K.” The second screen needs a suitable path from a downstream Thunderbolt port. Before buying anything, trace both connections all the way from the laptop to the panel.

Draw the two display paths

Write down the input sockets on each monitor, including any currently occupied by another computer. Give the HDMI port on the dock to the screen that needs it most. Then identify how the other display will accept video from a downstream Thunderbolt port. A monitor with a compatible USB-C video input may simplify that connection. For an HDMI-only display, account for a suitable adapter or cable and its supported resolution and refresh rate.

Consider a common home-office arrangement. Yesterday both screens were connected directly to a desktop. Today a laptop needs to drive them while leaving the desktop available for occasional use. A diagram of the free inputs may show that one monitor has a spare DisplayPort input. That gives you another cable choice and can avoid unplugging an existing connection every morning.

Check what the laptop can send

Start with the exact computer model and port specifications. The connector shape alone cannot tell you how many independent external displays the host can drive. Kensington lists dual 4K at 60 Hz with compatible equipment and a single external display for a USB-C Alt Mode host. Its documentation also lists a single external display for base M1 and M2 MacBooks with this dock. Identify the chip precisely when checking a Mac.

Write the target resolution and refresh rate next to each screen on your diagram. Two extended desktops are a different goal from showing the same material twice. Check the computer manufacturer's display limits, then Kensington's host-specific limits, and finally the cable or adapter on each branch. The lowest supported mode along that branch sets the practical ceiling. An especially capable monitor at the end cannot fill a gap earlier in the chain.

Decide which cables should stay put

The front panel has the SD card slot, a USB-A port, an audio jack and the host connection. Picture where the laptop will sit when connected. The front-facing cable should reach comfortably without crossing the mouse area. Leave enough room to insert and remove a card with one hand. A dock pushed behind a monitor can keep fixed cables out of sight while making a frequently used card slot surprisingly inconvenient.

Kensington specifies 96 watts of laptop power delivery for K33040NA. Compare that figure with your computer's charging requirements, particularly if the computer normally uses a larger power supply. Check whether the laptop accepts power through the chosen port. If you still need the original charger for your workload, leave its cable in the diagram and judge the desk arrangement with both connections present.

Count the actions saved each morning

Imagine arriving at the desk with the laptop in a bag. Which connections would already be waiting on the dock? Include the monitor cables, network cable and permanent peripherals. Then count what you still have to connect to the computer. That short exercise gives the dock a concrete job and makes it easier to decide whether the one-time cable rearrangement is worthwhile.

The SD5780T is a good fit when two verified display paths, charging and persistent peripherals can share a compatible host connection. A photographer who regularly inserts SD cards also has a reason to keep the front panel within reach. If you need only one HDMI display and a mouse, a smaller adapter may already handle the daily routine. Choose the K33040NA once you can name the path to each screen and the cables that can finally stay on the desk.