CABAC uses up a bit of gpu but more efficient than CAVLC (unchecked). its only worth turning off if you dont care to much about the size and have really high settings i.e. 1080@60. in that case, you might be able to squeeze out a little more quality sacrificing bitrate.I don't understand, I thought that CABAC is supposed to be unchecked... What's better for someone that has weak CPU like mine? Checked or unchecked?
in other words, check it if you are streaming.