On: On the dimensionality of spacetime (1997) [pdf]

[simonh]

Can’t we already radiate heat into 3 dimensions?

[radarsat1 → simonh]

I think what he means is that chips are 2D, so heat is radiated orthogonal to the plane of the circuit -- up or down.

[paulddraper → simonh]

Yes. See: radiators

[alexey-salmin → paulddraper]

Heat from the chip to the radiator still flows in one direction. So you're effectively limited by the bandwidth of this joint even if you have radiators or liquid-cooling (remote radiators) later in the pipeline.