OS: Linux Kubuntu 14.04
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) Server VM (build 25.5-b02, mixed mode)
In 14w29b MInecraft will render all cchunks/cubes, even the empty ones. I attached some screenshots (14w29a and 14w29b).
In 14w29a "C" is much lower, and increases when I place blocks in prevoiusly empty chunks/cubes. In 14w29b it's constant (when there are no chunk updates).
Enabling/Disabling VBOs makes no difference.