Just fired up the Dell UP2715K and can confirm this is still able to do 5K and Retina HiDPI resolutions.
The Terminal Command is still:
sudo nvram boot-args=nv_spanmodepolicy=1
Problem is, you need to have SIP disabled to enter this.
Good news is our EFI cards all let you get to Recovery Mode to disable this.
Just Hold "Command-R" (we used to call it Apple-R when we thought different) at boot, the Recovery Partition is no longer a Partition, and will not show as a Boot Option
Under Utilities is Terminal, pop the baby open and type
Reboot into HS and run the above. Still have to power cycle the UP2715K to get the 5K to kick in
10/9/2017 07:50:46 am
Before update my Mac Pro to macOS 10.13 (17A405) the mac not start and continuously loop reboot width screen "Your computer restarted because of a problem".
10/9/2017 10:10:52 am
10/10/2017 01:24:54 am
I can't access my Mac Pro right now, but the response I get is something like it's already set like that (there's nothing to change, already set to nv_spanmodepolicy=1 ; and if I use the command in your guide to check, it's correctly set).
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