GPU Water Cooling
Water circulates through a water block that transfers heat from the GPU to the water. The water passes through a radiator to be cooled. To install it, the heat sink that comes with the card is removed and the water block is mounted on the chip.
The GPU generates tremendous heat when running gaming graphics. It can safely operate at 90 degrees Celsius, before the system automatically slows it down. Water cooling greatly reduces the operating temperature (see Mojo Game Studios Water PC for some stats) .