What are memory slots and external cache?

Memory slot is a place where a memory can introduced to a system. It is an interface to add a memory device. This can be various types. For introduce primary memory we use tha RAM slot. Or for secondary memory interfacing we use different types of interfacing, such as PATA, SATA etc. But for RAM interfacing we require to match FSB (BUS Speed) of the memory device, such as FSB 400 or 667 or 800 etc.

External chache is noting but a chache memory that is attached to a computer system to optimise its performance. It is used to boost up the performance of a conventional computers.