Originally Posted by cadaveca
I think perhaps the fact that the solder uses relatively rare minerals might play a role in them making this decision, which actually holds a lot more common sense than first meets the eye.
based.. which, as u said is rare
: "Indium is used as a thermal interface material in the form of pre-shaped foil sheets fitted between the heat-transfer surface of a microprocessor and its heat sink. The application of heat partially melts the foil and allows the indium metal to fill in any microscopic gaps and pits between the two surfaces, removing any insulating air pockets that would otherwise compromise heat transfer efficiency."
Intel Patent(2010)-Methods of fabricating robust integrated heat spreader designs