What is Microsoft / Corintis In-Silicon Microfluidic Cooling?

In-silicon microfluidic cooling, developed by Microsoft with the startup Corintis, moves the cooling channels from a cold plate mounted above a chip's package into microscopic, branching channels cut into the silicon die itself. The design is intended to reach the internal heat sources of dense multi-chip and future 3D-stacked packages that top-side cooling cannot access.