In a computer, a register is the fastest memory. ... Cache memory is extremely fast memory that is built into a computer's central processing unit (CPU). The data that is stored within a cache might be values that have been computed earlier or duplicates of original values that are stored elsewhere.

Which is the fastest cache or register and why?

Register is the fastest memory because CPU direct access the data stored in register. Register is the part of CPU and more closer than Cache so it is much faster to access from register. CPU access the register for data if it not found in register then it search from cache.

Are registers faster than memory?

Registers are faster than memory. RAM is much slower than registers.