Samsung first introduced a water-based cooling system in the Galaxy S7, and just announced a much improved version that will ship in the Galaxy Note 9. The system features a porous, water filled cavity that carries heat away from the SOC using carbon fiber as a highly efficient TIM. In the Galaxy Note 9, Samsung added a copper layer between the 2 different TIM layers and dramatically increased the size of the heatspreader, allowing the device to dissipate far more power under sustained loads than previous generations.