New PC for 5 accounts on WoW

[Ughmahedhurtz]

From a systems performance standpoint, will there be a difference in running two 27s uhd at 1080p versus a 40 uhd 4k?

I'll just chime in here and say that there is a difference even between a 4K monitor (8,294,400 pixels) and two 1440p monitors (7,372,800 pixels total), with the 4K being notably more observable load on my 980Ti 6GB card. I stuck with a couple of 32" 1440p displays which were the best performance with that GPU and a 6600K CPU. Your selected 2070 should be a lot more capable at 4k than mine, so there's that, though if you're wanting to do streaming and a bunch of other stuff while gaming, this might be worth some thought.

Also, do your research on motherboards before you pull the trigger if you're gonna use a M.2 NVME SSD (unless you plan to use one of the Intel PCI-E adapter boards). I've noted some people (me included) have had issues getting proper PCI lane and SSD write performance (probably related) out of the M.2 cards using on-motherboard connectors, even using two of them in RAID 0 (which exposed even more latent OS boot issues, don't get me started). I just gave up on it and went back to a couple of Samsung 840 Pro SATA SSDs, which gives me "close enough" performance at a cheaper price point and didn't mess with my PCI lane usability. Newer chipsets hopefully have resolved most of that but do your homework.