Hey, I have a MacPro with the following spec: 2.7Ghz 12-core with 30MB of L3 Cache 64GB DDR3 1866MHz 1TBI PCIe-based flash storage Dual AMD FirePro D500 GPU's with 3G of GDDR VRAM each My screen is a Dell UltraSharp 32" Ultra HD 4K. Yesterday I connected an additional DELL P2715Q 27" ULTRA HD 4K screen and the performance of my Mac slowed down drastically. I am using Bootcamp and OSX at the same time and Bootcamp was entirely out of order. Is the MacPro not capable of handling 2x4k screens or will another 32" work just fine? I am quite confused here and trying to trouble shoot the issue. I want a dual monitor setup which is why I got the maxed out MacPro in the first place but its disappointing if I can't run them both at 4k. Even at scaled resolutions the performance was incredibly slow.