I'm typing this on my Thinkpad X120e netbook, which I love in terms of it's performance, battery life, and overall usefulness, but there's one small thing that's niggling at me. The fan is almost constantly running, even when it's sitting here doing nothing. The power draw of this laptop is about 15 watts, most of which is going into the screen backlighting, so there's no real reason why the APU should be idling at ~60C. I've tried TPFanControl as well, but the "Smart Fan 1" setting still has the fan running and has a far worse behaviour than the BIOS fan control as soon as the temperature does rise (fan toggles from high to low constantly). After a bit of digging, I managed to find the hardware maintenance manual from Lenovo. On page 77, it describes the thermal rubbers that come with a replacement heatsink/fan assembly. I've dealt with other laptops that used these rubber pads before, and manufacturers often rely on their thickness to fill the gap between the heatsink and the CPU/GPU/APU. I was thinking of removing my existing heatsink, and adding a copper shim (with TIM top and bottom) to fill the gap. I was hoping that someone might have some insight as to whether this would help my laptop cooling scenario. I'm also wondering if I would have to take any additional precautions to prevent the shim from moving (thermal adhesive to the existing heatsink?) or if the pressure of the mounting system would/should hold it in place.