Before my Pentium D (notorious for getting way too hot) with stock heatsink and fan was idling at 60, stress at 75, until it reaches 77 and turns off, and I used AS5. Obviously the heatsink and fans needed some cleaning, because they used to idle high 40's... BUT! I decided to clean it out and reseat my heatsink yesterday, and I picked up some Ceramique (for the price)... And my machine is idling in low 20's! I'm super excited. I highly recommend this product I'm wondering though, what exactly is the difference, and do other people get the same results with ceramique as opposed to as5, or what exactly are your preferences?