3440x1440, single display. Samsung Technical Support is never available and NO Samsung employees know anything about Samsung DeX. They do not know what 1080p, 1440p, HDMI, or DisplayPort is. They have no idea what their own products support. It's just a hellish call center that never calls you back and transfers you. Samsung is the worst in this regard. 3440x1440, 2560x1440, 2560x1600, 2560x1080, 1920x1080, and 1920x1200 all work. Samsung is happy to sell you 3840x1600 and 3840x2160 and 5120x1440 monitors, but NONE are compatible with DeX. 3840x1080 and 3840x1200 are also peculiar resolutions (that are available!), but DeX does not work with them. The Samsung DeX team has no ability to reply to customers, so we should assume that they will never support: - VRR, 75hz/120hz over DeX - Multiple monitor support - 4K support over DeX Samsung DeX is possible connected to a Windows PC, but nobody knows the max resolution. We can suspect it is 1920x1080. I recommend Huawei's EMUI Desktop mode - it supports desktop mode over wireless connection, which Samsung products do not. But, it caps out at 1920x1080. LG phones also do video out, but have no dedicated software for this. You can find apps that do windowed-like OS from the play store. LG supports higher resolutions. What Samsung DeX offers is a complete mystery, thanks to their customer support being ignorant and unresponsive. I would not expect much support for DeX in the future and you may end up buying products that don't work with DeX. DeX is nice on 3440x1440, though. It's a shame all their emails go unanswered, their online chat is useless, their phone center provides no answers, and their in-store reps have no clue with DeX is or what resolutions it supports. It's a great feature that is tragically useless due to middling Samsung support and no continued efforts to continue its advancement. If you have a high-end phone, I might recommend DeX + 3440x1440.
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