I don't have any recorded temps, but I just installed 77.72 on my 9860 and it is a noticable difference in the heat between this driver and the 71.20 I had before! It's an incredible difference to me. Usually the palm rest is so hot while just running the computer and web surfing. It used to be a coffee mug warmer. Now it actually feels cool. Even when playing HL2, I notice a good difference in temp. My palm isn't roasting like it used to!