Making cache a part of the processor caused manufacturers to move from sockets to slots in the late 1990s

The description of the discussion has been illustrated throughout the explanation segment elsewhere here.

Explanation:

Processors started to incorporate constructed L2 cache, acquired as completely separate chips from multiple vendors of Static Random access memory chip. This same processor and after that usually consists not of even single, and therefore of many other processors, that everything positioned upon its motherboard, which would then be inserted into another motherboard socket.

There’s also the option of making a new one