I'm looking at the Dell UltraSharp monitors that run at 2560x1440. I realize my retina can't output to a 4K monitor, but I was wondering if it could handle 3 @ 2560x1440 with my laptop in clamshell mode. The two thunderbolts shouldn't have an issue, but I'm not sure about the HDMI port. If it makes any difference, I also have a Early 2013 MBPr with the same graphics card. Not sure if this one can handle something my Mid 2012 can't. Any help is appreciated.