@bgrube7174 The Intel GPU built into the Latitude 7400 only supports 3 simultaneous independent displays, counting the built-in display if it's active. The only way around that limit would be to connect at least one of them through technology that relies on "indirect display" technology like DisplayLink -- not to be confused with DisplayPort. There are DisplayLink dongles that plug into a USB port and give you an HDMI or DisplayPort output, and there are whole docking stations that use DisplayLink. However, DisplayLink has some drawbacks that I've written about in the post marked as the answer in this thread. You might decide that those drawbacks are worth risking or even putting up with in exchange for being able to run your desired number of displays, but just be aware of what to expect.
Beyond that, I can't really add anything else at this point since you didn't specify your dock model or anything about the displays you intend to run. That may have been useful since there are also bandwidth constraints that may have to be considered when evaluating whether a given dock can run a given external display setup.
jphughan
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March 1st, 2021 14:00
@bgrube7174 The Intel GPU built into the Latitude 7400 only supports 3 simultaneous independent displays, counting the built-in display if it's active. The only way around that limit would be to connect at least one of them through technology that relies on "indirect display" technology like DisplayLink -- not to be confused with DisplayPort. There are DisplayLink dongles that plug into a USB port and give you an HDMI or DisplayPort output, and there are whole docking stations that use DisplayLink. However, DisplayLink has some drawbacks that I've written about in the post marked as the answer in this thread. You might decide that those drawbacks are worth risking or even putting up with in exchange for being able to run your desired number of displays, but just be aware of what to expect.
Beyond that, I can't really add anything else at this point since you didn't specify your dock model or anything about the displays you intend to run. That may have been useful since there are also bandwidth constraints that may have to be considered when evaluating whether a given dock can run a given external display setup.