Gobian, in order to get the memory hack from Alex you need select Memory hack ON on RAW menu and photo quality RAW, not jpg (the oposite as nr noise reduction, that needs jpg). Because that trick I thought at first (and I think 1% also) that the hack didn't go on 6D.
And really is better than 5Dm3. We have 3 more 32m buffers. 5Dm3 only 2 (but they have CF...) (Then with this hack you can take RAW photos and RAW videos without changing configuration)
Doing so, you get 7 buffers on raw recording, video or photo
For raw video stabilization in photo mode I use start delay to 2 sec. on raw menu, to get time to start pressing the shutter button all the time while recording (M mode)