RESULTS for GPU intensive Pro App functions:
Photoshop CS6 - render Iris Blur on 159M test image
2012 iMac 3.4 Core i7, GeForce GTX 680MX = 15.6 sec
2011 iMac 3.4 Core i7, Radeon HD 6970M = 19.1 sec
2012 iMac 2.9 Core i5, GeForce GT 650M = 25.5 sec
2012 Retina MBP 2.7 Core i7, GeForce GT 650M = 25.0 sec
2012 Mac mini 2.6 Core i7, Intel HD 4000 = 212.0 sec
Photoshop CS6 - render Tilt/Shift on 159M test image
2012 iMac 3.4 Core i7, GeForce GTX 680MX = 5.8 sec
2011 iMac 3.4 Core i7, Radeon HD 6970M = N/A
2012 iMac 2.9 Core i5, GeForce GT 650M = 8.5 sec
2012 Retina MBP 2.7 Core i7, GeForce GT 650M = 8.4 sec
2012 Mac mini 2.6 Core i7, Intel HD 4000 = 21.8 sec
Final Cut Pro X - render Directional Blur effect on 30 sec Apple ProRes 422 (HQ) 19x10 video
2012 iMac 3.4 Core i7, GeForce GTX 680MX = 10.0 sec
2011 iMac 3.4 i7, Radeon HD 6970M = 24.7 sec
2012 iMac 2.9 Core i5, GeForce GT 650M = 17.7 sec
2012 Retina MBP 2.7 Core i7, GeForce GT 650M = 13.4 sec
2012 Mac mini 2.6 Core i7, Intel HD 4000 = 32.2 sec
Final Cut Pro X - render Rain effect (lower is faster) on 30 sec Apple ProRes 422 (HQ) 19x10 video
2012 iMac 3.4 Core i7, GeForce GTX 680MX = 13.3 sec
2012 iMac 2.9 Core i5, GeForce GT 650M = 24.1 sec
2012 Mac mini 2.6 Core i7, Intel HD 4000 = 49.0 sec
Motion 5 - render RAM Preview of 600 frame HD template (higher is better)
2012 iMac 3.4 Core i7, GeForce GTX 680MX = 40.8 FPS
2011 iMac 3.4 Core i7, Radeon HD 6970M = 25.2 FPS
2012 iMac 2.9 Core i5, GeForce GT 650M = 17.0 FPS
2012 Retina MBP 2.7 Core i7, GeForce GT 650M = 19.9 FPS
2012 Mac mini 2.6 Core i7, Intel HD 4000 = 9.5 FPS