Going to buy a T7600 processor (which is compatible with my model) and I'm confused about the black stuff on top of the chip. Am I supposed to remove the black stuff or leave it on? Some pictures have the processor with the black stuff on it and others show just the metal. What does it need to look like before I connect the heat sink to the processor with thermal grease (using Arctic)? Here are pictures for reference - look at the black versus shiny metal.