No real tips needed. Enable DSR in Nvidia Control panel(you can do this now if you want), check all the 1.2x, 1.4x boxes and these will give you additional resolution options in-game. 2.0x = 4k(2160p), while 1.4x would be something like 1440p. Even if you don't do this in TW3, you'll want to know about this for other games, especially older games that you'll max out super easily.
I played for about an hour, mainly just doing this one quest. It wasn't a super rock solid 30fps, but it was pretty close. Pretty sure it was just daytime, and I don't think I went into villages or anything, so maybe performance would be worse in different conditions. Either way, you can definitely go a fair bit higher than 1080p if all you're doing is 30fps. I'd take downsampling over Hairworks any day, but that's just me. Obviously anybody else will make their own decision on what is more worth it, I just wanted to let them know it was an option.
I did mention I had some settings turned down/off though, right? It wasn't all on Ultra. Performed well for me, I just missed the fluidity of 60fps too much.