The resolutions in parantheses are what it's actually rendering at, and what you need to select in-game to actually use that (DL)DSR mode.
Well then I'm even more confused now because those resolutions aren't showing up as options in games. I mean, they are in FFVIIR but that game lets me choose a bunch of resolutions all the way up to 4K even with DLDSR off so I'm assuming that's just its own options.
But in Monster Hunter World, for example, it normally caps off at 1440p but with DLDSR on the new resolution option is 4K. Here's the same behavior in Hitman 2's launcher. Left is DLDSR off, right is with 2.25x (2880 x 1620) on:
You can understand my confusion lol. At this point the only explanation I can think of is that NCP is using my second monitor's 1080p resolution as a base for the options it offers, for some reason...
edit: Yeah, that might be it. Turning off DLDSR, moving NCP to my main monitor, closing and relaunching it makes it show the correct 4K resolution next to 2.25x. But if I turn it on, close NCP and relaunch it (on the same monitor) it's back to 2880x1620 lol. Just gonna chalk this one up to NCP being weird, I guess.