This will be a bit of a rant & I fully expect the Apple apologists to come running to their defense but frankly I feel its a well justified rant. Heres the deal. I had an iMac late 2011 with an ATI Radeon 6970m. I used it for Eyefinity gaming across the iMac display and 2 23" Cinema Displays via the Thunderbolt ports. It ran perfectly but as time progressed and games became more demanding it started to show its age. I've just upgraded to a top spec iMac late 2013 with an Nvidia 780m 4gb GPU. Guess what. It won't do Nvidia Surround. There is no possibility of running 3 screens in gaming. 2 years in the computing world is a long time. We're used to seeing progression in our systems & paying the price for it. Never more so than with the prices we pay for Apple equipment, especially in Europe. As screen prices have lowered multi-display gaming has soared in popularity but with a 2,600 iMac you can forget it. What is the point in giving a system 4gb Vram on a GPU designed primarily for gaming (Its not a Quadro) if you cannot use it. Its just marketing BS. Apple know it. Nowhere was it stated that a function available on a 2011 iMac was not available on a 2013 model. You can blame Nvidia all you want but Apple made the choice to go with them not ATI knowing this would be removed. So a word of warning to gamers considering buying an iMac. Simply don't. I hate PC's and put up with Apples huge prices for the style and thought put into them but removing features such as this is unacceptable. I'd even put up with every iMac I've ever owned being faulty with known design flaws in the 2009-2011 models screen staining while they charged their customers for their faults. This fifth is my last. PC gamers claim you cannot game on an iMac & I'd always defended both them and Apple but thanks to Apples choices with the latest iMacs their statements of the disparity between PC's and iMacs in gaming has gained even more force. Having paid 2,600 on a machine in 2014 with less features than my older 2011 model I'm now left with the only option being to sell it at a significant loss (after Apple replace the faulty screen with appalling backlight bleeding & image persistence). Apple gaming, or anything else, never again. Adios Apple. After 10+ yrs of Apple loyalty I've finally had enough.