S2721Q, connect two via DP?

The S2721Q/S2721QS monitors do not have a DP OUT port. They have IN ports only (HDMI 1/HDMI 2/DP). So you cannot daisy chain them together.

Each S2721Q will have to connect directly to two different video out ports on the Surface Pro 4.

@Thusit  In order to run a daisy chain, you need displays that support daisy chaining, which involves a dedicated DisplayPort output, which these displays don’t have. To use the ability of a DisplayPort output to run multiple independent displays when you don’t have displays that support daisy chaining, you need a device called an MST hub, which is a box that plugs into a DP, Mini-DP, or USB-C port and gives you multiple video outputs. But the problem here is that I don’t think your system’s Mini-DisplayPort output has enough bandwidth to run dual 4K 60 Hz displays from that single port. That would require DisplayPort 1.4/HBR3 support, which I don’t think is available on that system. The Surface Dock 2 can run dual 4K 60 Hz displays, but not when paired with a Surface Pro 4. You need a newer system for that.

And for that matter, even with your Mini-DP to HDMI cable, you might not be getting 4K at the full 60 Hz refresh rate. Typical passive MiniDP to HDMI cables rely on the source port supporting “Dual Mode DispayPort”, which is the ability of that port to switch to native HDMI. That capability is often available, but a MiniDP output that can run 4K 60 Hz via native DP signaling will not necessarily be able to do that when running in HDMI signaling mode. So if you find that you’re only getting 4K 30 Hz or 2560x1440 60 Hz, then you’ll want to get a Mini-DP to DP cable for that one S2721Q instead.

Hi, I'm trying to understand this thread. I am hoping to run two S2721QS monitors through my new XPX8950, so for example, I can conduct a Teams meeting on one and maybe have a document displayed on the other. Are you saying this cannot be done? Please explain!