I want to buy an iMac for my wife. Currently, I can get the older one for $200 cheaper but that's not too important if what I read is true. My wife will use Lightroom and Photoshop a lot for editing photos. I found this at this link: https://discussions.apple.com/message/24202540#24202540 Question: These models appear to be exactly alike except the newer one (ME086LL/A) has the Intel Iris Pro graphics processor and the the older one (MD093LL/A) has the NVIDIA GeForce GT 640M graphics processor. Is the Intel Iris better in any respect than the NVIDIA? Thanks. MacBook Pro, Mac OS X (10.6.8), 2.2 GHz Intel, 4 GB ram This solved my question by David M Brewer on Dec 21, 2013 10:38 AM Answer: NVIDIA GeForce GT 640M uses what is called CUDA. CUDA uses the graphic card to speed up graphics and video rendering... for example... Photoshop, Final Cut Pro X (I think) and 3d software like Blender. This can speed up rendering time by 4 times or more. Intel Iris doesn't support CUDA. I would go with the NVIDIA GeForce GT 640M card.