I am a little confused with the terminology with what's a passive and active heat sink.
First of all I want to know where the motherboard comes with this heat sink pre-installed as shown in the following picture?
if, yes, then it is already a passive heat sink which doesn't require you to install anything?
In some cases as here shown in the following:
Am I seeing a fan mounted over the passive heat sink or is it something different altogether called active heat sink? Why is the fan necessary if it is already a passive heat sink? Would you call the last one active-passive heat sink?