New Laptop

[MiRai]

I've edited your parts list to be much more readable since it was a jumbled mess of repeated lines and missing carriage returns (this is usually what happens when you copy and paste parts lists from other websites), but I'm guessing I didn't get the drives right since you have three different M.2 SSDs listed (it really doesn't matter either way).

First, I don't know how they are claiming that the 980 is the "desktop version" when it comes equipped with 8GB of VRAM. The desktop version of the GTX 980 has only ever been equipped with 4GB of VRAM, and it's only the "laptop versions" which come with double the VRAM. Why? I don't know since laptops are never going to utilize twice the amount of VRAM that a desktop is.

Second, it's highly unlikely that a single 980 is going to be able to power a multiboxing team while using a 4K resolution, and you're probably going to be forced to use a lower resolution on each game client, or straight up change the desktop resolution to be something lower and create your team with that. It's also unlikely that a single 980 will power most games at 4K without the need to drop several settings down in order to maintain a smooth, playable framerate (although WoW is less demanding than most modern games). (Benchmarks* 01 / 02 / WoW)

So, while more expensive, I would probably go with the GSync display laptop since it's going to be nice and smooth even if you're not at 60 FPS all the time, because you are going to be using a normal 980. 4K is really nice, but I think trying to get a single 980 to work well at 4K is going to be a less-than-stellar experience whether you're multiboxing or not.

* Linking to 980 Ti benchmarks to show how the GTX 980 compares with more modern GPUs with matured drivers.