I'm looking at upgrading my late 2011 MBP and trying to choose between the 2015 retina that's still on sale, or the new touch bar MBPs. My main use is photography using lightroom and photoshop. Looking at the spec of the 2015 model the graphics card is an Intel Iris Pro but does not give any more info than this. Looking on google it suggests that this card is only 128MB which seems very small as my current graphics card is the AMD radeon 6750 which is 512MB, 4 times more than the iris pro (according to google). Surely I'm missing something as I can't believe they'd take such a step back, so what is the difference? I see that the new touch bar MBP's have the radeon pro 450 and 460 with 2GB and 4GB respectively. For what I use how much does the graphics card play a part and would I notice any difference from the 2015 MBP to the touch bar, and would I notice a difference from 2GB to 4GB? My current MBP can get bogged down, especially when working at 1:1 image size but I don't know if this is a limitation of the RAM (I have 16GB), software, CPU, or graphics card? Any help appreciated. P.S. It does appear that my graphics card is no longer supported by Lightroom and I get this error message.