Shikhee
Not sure how you guys get +100 and more on the core, I've found stability around +80. I have mine under a hybrid kit, it maxes out at 53c, usually boosts to like 2055mhz in games stably. I don't bother with benching software though, I might soon. I usually just set the power limit as high as it will go and let nvidia's boost take care of itself. I get +1000mhz on the memory though before performance starts to go down due to error checking.
As a gamer I'm not a big fan of benchmarking... yay you got hundreds of points more wooooooooooooo but only .02 FPS more. Sure it's great for a baseline/comparison but not good for real life scenarios. I get it though, it's a game and trying to get a high score or squeeze performance. (been there, done that but I just want to frag others better :)
With my 150core/699mem and an hour of gaming I hit max boost of 2145, gpu temp 57.3, 106% TDP so I'm happy with the gains that are there. (just a mild OC that lets me boost to the level I want keeping temp sin check and not degrading performance)
So much playing to do though, never undervolted but I'm sorry I would rather get +5 fps and cook this egg than -5 fps and be green...