To explain this comment, flashing the 39" model to the 50" FW enables true 1080_120 display mode, as opposed to the stock FW's frame doubling.

2160 is limited to 30Hz, but that's hardly an issue for anything but games, most of which are better played in other display modes anyway. Besides, it doesn't make sense that someone who cared enough about hires gaming to buy a GPU beefy enough to run games at >30fps in 4k wouldn't just buy an appropriate monitor as well.