Pubg is pretty demanding on highest settings and high resolution, but I think fallout 4 takes the cake by recommending a fucking 1080 for highest settings
Watch Dogs 2
I play it at High settings (not ultra) with a OC GTX 1070 and I get around 60fps, sometimes it drops into low 50s at 2560x1080.
Meanwhile
GTA 5 at max settings w/ FXAA and MVGA + Redux ReShade = ~ 110fps
Yep, I've never seen anything punish a CPU harder than Witcher 3. I use Witcher 3 to test stability after overclocking, because it's even more effective than torture testing at weeding out an unstable overclock..
Combat Flight Simulator WWII Europe . one of the best combat flight sims that I currently own and I am at the difficulty of Veteran , I haven't tried the difficulty of Ace as of yet though .