I'm a designer and recently replaced my work iMac with the 5K model and now coming home to 2 27" Cinema Displays is not quite as visually appealing I've been considering buying a 5K iMac to replace my 6 core cMP but not sure it's the best choice. I've seen a well price UP2715K locally and wondering if my flashed 7970 will run it? I know MacVideoCards posted that it doesn't work but has anyone tried it more recently in El Capitan? It'd be nice to run that with a 27" Cinema Display as well. Probably pushing the limits of the 7970 then. I'd buy a flashed 970 or 980 from MVC but the AUD is weak and it'd make the move more expensive than just getting an iMac 5k and selling the cMP and spare display. Downside to this solution is of course no Thunderbolt or USB3 with the cMP plus the Dell screen will look a little odd next to the Apple one.