Misconception Number 1: GPU only matters for gaming. Your GPU is always being put to work. The GPU is what drives the pixels on your screen, whether you are gaming or not. It is not a matter of gaming for me, who games on a Mac anyways? It is a matter of smooth and elegant user experience. Crap ton of pixels can hurt the experience if the GPU cannot keep up. I think the GT650M should be ok most of the time though.
Will do you think Apple would release a high profile product like this that cant run say LR or PS without issue? I highly doubt it. It will do just fine for those instances. And just for you i will ask them to run all of them at the same time plus Final Cut Pro in full screen mode. That was my test on my current mac and it ran with no issue. The experience was smooth and elegant then again we will say RAM has a hand as well 





