When I installed my heatsink on my thunderbird 1ghz, it took a lot of work. Particularly due to the 4 capacitors on my ABIT KT7-Raid motherboard (actually had to grind a bit of the sink off so it wouldnt be touching the capacitors and giving it enough room to put it on there). Unfortunately I cant test it yet due to the fact I'm waiting on my case. But the thunderbird chips, as well as the athlons I believe are odd. They have another small chip basically piggybacking the main chip. that bothered me quite a bit when I was trying to press on the sink to get the clips to grap properly. I just hope that the pressure of me pressing on it didnt snap the chip, seeing that the additional piggybacked chip is directly in the center and any pressure towards the center of a chip is never a good thing. I dont think the sink is making direct contact with the main chip, but rather just the piggybacked and the rubber feet looking things... is that okay? I applied the thermal paste, but i would have to layer the chip up pretty good to make contact between everything....