The goal is to quickly and efficiently conduct heat from the DRAM (A) to the outside world (B). You could generate a little power from the temperature differenc

The goal is to quickly and efficiently conduct heat from the DRAM (A) to the outside world (B). You could generate a little power from the temperature difference between A and B, but that would greatly reduce the effectiveness of the heat transfer. Perhaps that generated power could cool something else, but you'd waste power (and generate heat) in the process. Net loss.