Both seem to require employment of more expensive copper heat-pipe technology to assist thermal transfer from what must be very hot CPU dies to the aluminium fins.Pictures at The Inquirer
As can be seen, the most, er, dramatic of these, for Yahok, utterly dwarfs the 120mm chassis fan in the background.
Pictures of heatsinks for Intel Tejas and Yahok processors

The Inq has a picture of a heatsink developed by Zaward Corp. for Intel's upcoming Yahok server CPU and their Tejas.