I have an Asus laptop and I took it apart including the heatsink. The CPU is covered with thermal paste as expected, the graphics chip though is covered by a thin thermal pad similar to whats pictured below. I know of course that thermal PASTE must be cleaned and re-applied every time the heatsink is removed but what about the thermal pad? Does that also have to be replaced or can you leave it? It's not like pre-applied thermal paste the pad is kind of jelly like and solid.