Hi, Is it possible at all for the mid 2014 rMBP to push dual 4k external monitors? I know about the refresh rates and stuff. I don't even mind if it goes down to 30Hz. Especially if it's one at 52Hz and one at 30Hz. If this is dual 4k, it'll be in clam-shell mode. If it's not possible, then you all think this will be possible at the Broadwell refresh? Thanks!