The Kühler H2O 620
Figure 4 shows the CPU block into which the pump is integrated.
Figure 5 reveals base of the block. It is made of copper and comes with thermal compound applied. Note the two cables on the block: one must be connected to the motherboard in order to power the system; the other one powers the radiator fan- so that the circuitry at the block can control the speed of the fan.
In Figures 6 and 7 you see the radiator, which must be installed at a 120 mm fan opening at the rear of the case.
In Figure 8 is the 120 mm fan that comes with the H2O 620. Its cable is short because it is not intended to be connected to the motherboard but to the block wire, as we already mentioned.