It will move it by 0.5 every interval, but as for 'smooth movement' that you are looking for, you shouldn't notice any difference except for slower movement. I'm pretty sure it won't render a different position until it reachers the next integer (pixel). It basically means that you'll see movement every 2 position updates instead of 1.
I have no clue what plasma or HD really does with bitdepth or how it works at all, but maybe smooth float movement could be accomplished with HD in 3d?
I have no clue what plasma or HD really does with bitdepth or how it works at all, but maybe smooth float movement could be accomplished with HD in 3d?