I have the 2013 iMac with 780M, and right now I m tempted about buying the new 5K iMac, but I m not very confident about the GPU for that crazy screen (when your softwares also need graphics power). I work with 3D and that itself consumes GPU power, and sometimes I multitask btw applications like Zbrush, Photoshop, Unity and Maya. Right now my iMac does what I want and it gives me a smooth and quiet experience. Anyone here use the new iMac for those things? Can you share the experience? I m about to buy it or just wait for the next update.