Short for Level 2 caching, L2 is also commonly referred to as secondary cache or external cache. Unlike Layer 1 cache, L2 cache was located on the motherboard on earlier computers, although with newer processors it is found on the processor chip. When L2 cache is found on the processor, if the cache is also on the motherboard, it is more properly known as L3 cache.
Tip: The L2 cache is on the same processor chip and uses the same die as the CPU, however, it is still not part of the core of the CPU.
L2 cache was first introduced with the Intel Pentium and Pentium Pro computers and has been included with ever process since, with the exception of the early versions of Celeron processor. This cache is not as fast as the L1 cache, but is only slightly slower since it is still located on the same processor chip, and is still faster than the computers memory. The L2 cache is the second thing the computer looks at when performing instructions.