Pushed the iMac with 680MX hard under Windows 7 at 2560x1440 to see if it still beat the 680 Classified on the Mac Pro.
Heaven with 8X AA, 16X Aniso
680MX = 33 FPS
680 Classified = 44 FPS
WoW Pandaria at 8X AA, 16X Aniso
680MX = 77 FPS
680 Classified = 96 FPS
Team Fortress 2 at 8X AA, 16X Ansio
680MX = 88 FPS
680 Classified = 77 FPS
Left 4 Dead 2 at 8X AA, 16X Aniso
680MX = 86 FPS
680 Classified = 109 FPS
At least in these examples, the 680 Classified was faster than the 680MX. The exception is TF2, but according to the amps pulled by the CPU and GPU, it appears to be CPU bound even at the high rez.
Heaven with 8X AA, 16X Aniso
680MX = 33 FPS
680 Classified = 44 FPS
WoW Pandaria at 8X AA, 16X Aniso
680MX = 77 FPS
680 Classified = 96 FPS
Team Fortress 2 at 8X AA, 16X Ansio
680MX = 88 FPS
680 Classified = 77 FPS
Left 4 Dead 2 at 8X AA, 16X Aniso
680MX = 86 FPS
680 Classified = 109 FPS
At least in these examples, the 680 Classified was faster than the 680MX. The exception is TF2, but according to the amps pulled by the CPU and GPU, it appears to be CPU bound even at the high rez.