Imac i7 32gb ram nvidia 680 mx for AE color grading etc?

I am considering The new Imac, 3.4GHz quad-core Core i7 Nvidia GeForce GTX 680MX with 2GB mem.
The specs seem almost exact to any i7 hackintosh or PC custom build(of the same class)... except for the Graphics card which is the MX (laptop) over the GTX (desktop model). I am trying to decide whether to have a hack built or get the imac  and I would rather have one under apple care so that I do not have to worry about tech support as opposed to a hack build.
Does anyone have any experience or info on whether this imac will perform with realtime playback doing things like high performance effects in AE or color grade in speedgrade or davinci etc. I Would like to be able to work in real time and not have tons of slow playback issues. I believe that card works with MPE just not sure how well.
I will be using mostly hdslr .h264 footage.
Thanks in advance.

680MX
http://www.geforce.com/hardware/notebook-gpus/geforce-gtx-680mx/specifications
1536CUDA Cores 
720Processor Clock Tester(MHz) 
92.2Texture Fill Rate (billion/sec) 
Memory Specs:
2500 MHzMemory Clock 
GDDR5Memory Interface 
256-bitMemory Interface Width 
Memory Bandwidth (GB/sec)160
GTX 680 GPU Engine Specs:
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-680/specifications
1536CUDA Cores 
1006Base Clock (MHz) 
1058Boost Clock (MHz) 
128.8Texture Fill Rate (billion/sec) 
GTX 680 Memory Specs:
6.0 GbpsMemory Speed 
2048MBStandard Memory Config 
256-bit GDDR5Memory Interface Width 
192.2Memory Bandwidth (GB/sec) 
Desktop Video cards always have better performance than mobile just as CPU's. The only reason to get mobile Video is if you require a mobile editing solution. In regards to Imac's, that is one of the sacrifices you make for a OSX Desktop unit that has limited configuration and upgrade options. Imac's can handle editing that media but a PC unit will give you far better performance realtime especially with the X79 platform.
Eric
ADK

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