Ok so I a VGA Silencer Rev.3 from newegg, and I were inspecting it and noticed that the bottom of the heat sink the surface that actually makes contact with the GPU has grooves in it. They are kind of curved ridges on it, they are perfectly even like they were done with a giant circular sander. I wanted to know if this was normal b/c all the reviews I have read for this cooler said it had a very smooth shiny surface. If people have used this product before can they tell if the groves are normal? Also what is the best spot to put a temp sensor to get an accurate reading of the video cards temperature?