What Is The Working Principle of A Graphics Card Water Cooling Radiator?

The overall system consists of three steps: heat conduction and absorption, liquid circulation, and heat dissipation and release. It relies on the high specific heat capacity of the liquid to remove heat from the GPU. There are two logics: consumer all-in-one liquid cooling and server rack liquid cooling.

I. Consumer All-in-One/Separate Liquid Cooling (Desktop)

Heat Conduction and Absorption Stage: The GPU core, memory, and power supply module generate high temperatures under full load. This heat is conducted through the metal substrate to the copper base of the water cooling head. The water cooling head has a dense network of microchannels, and the low-temperature coolant absorbs heat through forced convection as it flows through.

Media Circulation and Delivery: The water pump inside the water cooling head continuously pressurizes the coolant, which, after absorbing heat and heating up, flows through the water pipes to the external radiator.

Heat Dissipation, Cooling, and Return: The radiator is covered with fine heat dissipation fins. The chassis fan blows air onto the radiator, transferring heat from the liquid to the fins and dissipating it into the air. The cooled coolant then flows back to the water cooling head through the pipes, forming a continuous closed-loop circulation.

II. Server GPU Cold Plate Water Cooling (IDC Data Center, same origin as optical module liquid cooling)

The GPU heat source is in close contact with a metal microchannel cold plate. Low-temperature ethylene glycol coolant is supplied from the data center CDU to the cold plate to remove heat.

High-temperature coolant flows back to the rack CDU and enters the CDU plate heat exchanger.

Primary chilled water and secondary loop coolant in the data center exchange heat in a counter-current flow within the plate heat exchanger, transferring heat to the data center chilled water system.

The cooled coolant is then circulated back to the individual GPU cold plates, eliminating the need for a chassis radiator and providing centralized, unified heat dissipation.

III. Summary of Core Heat Exchange Logic

GPU heat generation via solid-state conduction → Water cooling head/cold plate liquid convection absorption → High-temperature liquid transported through piping → Heat released by the radiator/CDU plate heat exchanger → Low-temperature liquid circulates back for continuous heat dissipation.