U2718Q, cannot daisy chain

Thank you Chris for clearing this up for me. I was under the impression that the mDP on the U2718Q is an output, but seems I was wrong.

Until DP1.4, UHD monitors will not likely have daisy chaining, as a single UHD 60Hz display consumes almost all of the bandwidth of DP1.2. he version has nothing to do with this discussion of the U2718Q. The U2718Q does not have a DP out port. So no daisy chain.>

Multiple cables? 2x USB-C to DisplayPort cables or adapters. Make sure it explicitly says UHD 60Hz or 4K 60Hz as many only support 30Hz at that resolution. Any USB-C that is not Thunderbolt that supplies USB3.X cannot provide UHD 60Hz (aside from VirtualLink which will not be applicable here).

Single cable? Thunderbolt 3 dock or adapter. Or a Thunderbolt 3 UHD monitor which can daisy chain with Thunderbolt 3.

The best way? Aorus Gaming Box RX580 external graphics will power the Dell 9370, provide graphics acceleration, 4x UHD 60Hz outputs, 3x USB3.X Type-A ports and another USB port for charging stuff.

I have all three of these solutions and prefer a single cable docking solution. Preferably Aorus external graphics, but at least get a Thunderbolt 3 dock with 2x DP like the HP Zdock 200W which I have. You will need to update the firmware on that HP dock to provide optimal charging to Dell 9370. Was only 36W to Dell before I updated the dock. Edit: to be more verbose, it showed 60W on my friend's Macbook Pro 2016 (15", touchbar, 4 ports). After the firmware update it went from 36W to 45W on the Dell, with 45W being the maximum the Dell 9370 will request. Also, if you are going between devices with 2016 Thunderbolt controllers to devices with 2015 Thunderbolt controllers, you will get a performance hit unless you use an active Thunderbolt 3 cable. For ages my external graphics was only measuring 1800MB/s and I could not figure out why. As soon as I got my 100W 2M active cable, it finally got the full 2750MB/s (Thunderbolt 3 allows for at most 22Gbps for data - the rest is for DisplayPort, and with 2x 4096x2304 60Hz displays, I believe there is only 8Gbps left for data).

That is why the external graphics is the best solution (for Windows only - MacOS support is still limited to select cards, and Linux theoretically has everything required, but the GPU drivers cannot handle surprise removal yet without crashing the system, and there would be a lot of benefits moving from X11 to Wayland). This is because the DisplayPort signal is manufactured at the dock, not sent to the dock from the internal graphics, which means you could jam a graphics card in there with 6-8 mini DisplayPort UHD 60Hz outputs if you needed them badly, and even use two external GPUs for 16x UHD 60Hz. Actually, there are ways of daisy chaining graphics, but they are not officially supported (GPU in external PCIe enclosure and find a way to add an external power supply to handle the load). Although Titan Ridge 2018 controllers might be changing that, as we have seen the Blackmagic external graphics which is the first external graphics to potentially support daisy chaining. Another benefit is that the heat from graphics processing is emitted outside of the laptop, up to 2M away depending on your cable. Make sure you update Thunderbolt firmware of Dell 9370 from NVM23 (ships from factory) to NVM33. The NVM23 and NVM28 both support external graphics and work fine, but the NVM33 firmware update for Dell 9370 sets the external graphics supported flag to "yes" so Dell are finally officially acknowledging and supporting it.