Whoops, brain fade. I meant unprocessed footage, not RAW. Therefore this is also probably the wrong forum.
As far as I'm aware the 60D follows 160/320/etc. I think this is different to other models. And based on visual observation from the video you'll see the muddy black (green) puddle resolve into detail every time it hits a multiple of 160. The other ISO's simply brighten the image but don't affect quality.