I've seen some people on YouTube saying they were able to connect an early 2013 MAC Book Pro with some 4K Monitors. I bought an 4K LG TV. It seems that I can't connect using 60Hz. I already tried the Thunderbolt connector and couldn't make it. Could anyone help me with that?
Most Macs with an HDMI port (besides Mac mini late-2012 and older) support 4K, but are capped at 30Hz or 24Hz. The MacBook Pro Retina 15" mid-2014 model supports 60Hz at 4K, but older models do not.
I personally have a MacBook Pro Retina 15" late-2013 model, and it can only do 4K at 30Hz
(4K is defined in my answer as 3840 x 2160.)