Keep in mind at 1080P or if you want to say 1440p but honestly most people don't have that yet, So lets just say 1080P...
Farcry 3 obv seems to be the winner for all of us, which is so odd considering the constant repeating low textures and crappy foliage I don't understand how 4 SLI titans can't even get 60+ frames in that game, unless that was fixed. At that point you can tell it is a problem with the game lol
Anyway. besides Farcry. I would say
Witcher 2 with Ubersampling on of course Tomb Raider with that FXX hair on, I get like 37 frames and I believe Hitman Absolution. It dips to like 31frames.
but nothing beats farcry 3, I never tried it, but almost close to maxed out. I get 23-25fps lol. Maxed out I bet I would get 10. lol
Metro: LL higher than 2xSSAA is probably the most demanding for me. I don't see how FC3 falls into this sort of classification. Ultra w/ 4xMSAA nets me a constant 50+. 8x brings that figure down to 35-40.
Turn vsync off and farcry 3 will run 60+ easy. Something is wrong with it. I max it out with a 670gtx. I had to edit the seeings to set a frame limit to keep from having constant screen tearing. I would have to say Crysis 3 and the Witcher 2 in stereoscopic 3d is the most demanding. Skyrim with mods is also pretty intense.