Don't forget also Mirror Locked up shooting.
In person, it's an appreciably quieter sound for the silent shooting mode.
In shooting silent - near unlimitless shooting - the buffer doesn't really fill up.
In high speed normal shooting - you can rattle a dozen or so shots off.
Using a 600x CF card made a difference in comparison to a 95MB/s SDHC card - the high speed CF card does replenish the buffer faster - once the camera's hit buffering it'll let you take 1-2 more shots then pause and repeat quicker.