A few more gaming reports from the Win7 side using Fraps before I flop over to OS X.
Alan Wake
(2560x1440, maximum settings, maximum distances, 16x AF, 2x AA)
Min fps: 22, Avg fps: 36, Max fps: 57
This is the first game that I have felt has really tested the 680MX. Alan Wake uses tons of lighting, smoke, darkness and other framebuffer-type blurring effects to create a totally thrilling experience and as such weighs heavily on a GPU. With 2x anti-aliasing, I saw 35 fps on average, and in areas of very high lighting or particle effects the frame rate dropped to mid 20's. Other times however, the frame rate jumped to mid 50's in areas without a lot of draw distance or effects. Completely playable, and wonderfully atmospheric.
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DiRT 2
(DX11, 2560x1440, maximum settings "Ultra" preset, 4x MSAA)
Min fps: 58, Avg fps:69, Max fps: 74
DiRT 2 is one of those great 'tons of fun to play' games that you just can't put down. However I endured through crappy performance on my 2011 iMac because I just had to play it. Crappy performance no more! DiRT 2 gave me a consistent 70 fps in essentially 95% of each race, only dropping to 58-62 during massive dirt kickup or splashes of mud and water for a couple seconds. Even then, these blips in the fps rate were virtually undetectable and the game was a visual feast and an absolute joy to play.
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Borderlands
(2560x1440, maximum settings, 16x AF, control panel forced 2x FXAA)
Ambient occlusion off, Flare Outs off, Dynamic Shadows off - Min fps: 43, Avg fps:57, Max fps: 64
Ambient occlusion on, Flare Outs on, Dynamic Shadows off - Min fps: 32, Avg fps:45, Max fps: 57
Ambient occlusion on, Flare Outs on, Dynamic Shadows on - Min fps: 23, Avg fps:34, Max fps: 44
Borderlands is one of those unusual games where changing a single graphical setting can swing performance WILDY in the opposite direction. Even on the 680mx, toggling Ambient occlusion, Flare Outs, and Dynamic Shadows just destroys performance, with the first two dropping the fps by around 6 each, and Dynamic Shadows dropping performance by a whopping 12 fps. Performance also depends intensely on the draw distance, with farther distances killing fps. Either because of a poor engine, or just simply a limitation of the rendering paths, I expected more from Borderlands performance. There are no built-in AA settings, so I found the fastest and most pleasant way was to force 2x FXAA to clean up those jaggies and incur a minor 2-3 fps performance hit. Can't wait to get the second Borderlands and try it out on the new 2012's! >_<
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Fallout: New Vegas
(2560x1440, maximum settings "Ultra preset", 15x AF, 4x AA, HDR On)
Min fps: 40, Avg fps:60, Max fps: 64
Excellent performance all around and essentially never drops below 60 fps. Expect Fallout 3 to perform relatively the same.
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Dead Island
(2560x1440, maximum settings "Best Quality preset", control panel forced 4x FXAA and 16x AF)
Min fps: 55, Avg fps:78, Max fps: 107
Dead Island just screams with the 680mx. The game looks beautiful and who wouldn't want a zombie RPG

. I could not get this to go below 60 it seemed. You can edit the ini for AA and AF, but I chose to just force it in the control panel.
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The Darkness II
(2560x1440, maximum settings, control panel forced 4x FXAA and 16x AF)
Min fps: 83, Avg fps:103, Max fps: 129
Another new title with fantastic performance. With some FXAA the cell shading is just gorgeous and compliments the arts style very nicely. I am amazed at how well this plays.