Hi. I have a grapics card question. Is it better to have Intel iris 1530mb or NVIDIA GeForce GT 755M 1 GB? Intel iris on fusion drive Mac mini model have 1,5gb grapics but maby a external card is better even it's less gb? I would like to know if the video card in a iMac me088 is better than the mini late 2014 fusion drive model Thanks!