When installing a radiator, a lot of pressure or torque is required. As the diameter of the radiator mesa is larger than that of the tube core, the radiator mesa is bound to deform under the action of this pressure or torque. If the tube core of the same diameter or larger diameter is installed on the radiator, it will lead to poor contact between the surface of the table and the tube core, so as to not ensure good heat dissipation effect. If the user needs to reuse the radiator, it must ensure that the surface roughness, parallelism and flatness of the radiator table meet the requirements, otherwise it is easy to damage the device due to overheating in operation. Especially water-cooled series radiator, before repeated use, must carefully check its mesa deformation, if there is obvious sagging phenomenon, should be replaced. In order to ensure good heat dissipation conditions, each tube core should have the corresponding radiator matching.