This heatsink may look like a standard aluminum cooler but on the inside it uses a very neatly little bit of technology to improve performance. Tocools call this technology "Pyramidal Inside Cutting" and while that is a little bit of a play on words, it does describe the technology... sort of.Let's start with the basics; because most heatsinks are extruded from a mold under high pressure and heat there are some basic limitations thermal engineers have come to accept. The most basic one which relates to this heatsink is that extrusion heatsinks are essentially three dimensional representations of a one dimensional pattern. A die is cut based on a line drawing and that means the shape doesn't change.